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Some argue that the total number of stocks covered by Wall Street analysts is shrinking at an alarming rate. SmartMoney put out an interesting article underlining this fact, illustrating that the total stocks covered today is quite small compared to a few years ago.

To make the comparison more relevant, SmartMoney shows that in 2000 there were more than 7,600 firms that captured the attention of at least three analysts. Since then, the number has fallen dramatically down to below 6,000 such companies. This change could be explained in part by the fact that analysts prefer to analyze big companies which show potential for a further development.

This logic is quite simple, as every investor would rather invest in a more reliable company rather than a small one that could turn into a nightmare. Another factor that determines analysts' decision to cover the bigger companies is the fact that the bigger companies tend to have more news available that the analysts can use to discuss the companies new developments that attract investor attention. However, limiting the decision of which stocks to cover to these criteria could leave out many potentially attractive stocks for investors to consider.

Shares of agricultural equipment maker Deere & Co. (NYSE: DE) have been plunging in early trading more than 6% despite posting a rise for its second-quarter profit, as its earnings per share were a bit shy of analysts' estimates. In addition, the company warned about further higher costs threats.

For the quarter, the world's largest manufacturer of agricultural machinery reported that its profit surged 22% to $763.5 million, lifted by soaring crop prices that increased international demand for agricultural equipment. The company posted earnings of $1.74 a share, slightly missing analysts' predictions for earnings of $1.75 per share in the quarter.

The agricultural equipment maker also announced a respectable 18% jump in revenues to $8.1 billion. Revenue during the period was helped by a 47% increase in overseas sales that benefited from the weak U.S. dollar. Analysts had forecast a lower revenue of $7.6 billion, according to Reuters Estimates.

Most of us would be thrilled to invest in a stock that doubles our money, but it certainly isn't easy to find these stocks. According to data provider Capital IQ, in the last year only 1.4% of 6,700 stocks trading on the U.S. exchanges were able to double their price.

BusinessWeek started hunting some of these potentially great stocks by asking fund managers to choose those firms expected to provide 100% returns in the next few years. Of course, the resulting list is by no means a sure thing, since major factors such as the ongoing credit crisis and challenging market conditions could affect results in unpredictable ways.

But let's look at some of the strategies used when picking high-potential stocks.

Mary Lisanti, portfolio manager at the Adams Harkness Small Cap Growth Fund, focuses on young companies in the small-cap segment. She points to stocks like Rubicon Technology (NASDAQ: RBCN) and Titan Machinery Inc. (NASDAQ: TITN), saying that investors can have a big advantage when they recognize potential before the market does.

Nissan Motor Corp. (NASDAQ: NSANY), Japan's third-largest automaker, announced this morning higher fourth quarter profit, but forecast a decline in profit for the current year, blaming an unfavorable rising yen and soaring material costs.

Nissan Motor announced that its profit during the quarter jumped 67% to 137.6 billion yen ($1.3 billion). And its income figures were definitely something to cheer about. During its fourth quarter last year, the company had a profit of 82.2 billion yen. Excluding one-time "fifth-quarter" numbers, the company's earnings figures would have showed a surge of 95%.

Despite the positive results, the automaker isn't optimistic about its future earnings and issued a gloomy outlook. The company expects net income for the current year to drop 30% to 340 billion yen ($3.3 billion), which is below the 368 billion yen that analysts at Factset Research predicted. Nissan cited unfavorable currency exchange, higher commodity and energy prices, and increased material expenses.

I know that what you probably wanted to hear most is that the economy's slowdown is at an end so that some of your beaten-down stocks could enjoy a nice recovery. When the stock markets started declining towards the end of last year, SmartMoney tells us that analysts began to place bets on when we might see stocks rebound. Back then, many fund managers had expected a rally in the second half of 2008.

The Federal Reserve's decision to slash interest rates several times certainly gave a temporary boost to stocks -- not enough for a long-term rally, though. Daily concerns such as the deep housing slump and the rising inflation today give the impression that a second-half comeback is but a dream; it that would be quite hard to accomplish.

While analysts on Wall Street mostly believe a long-term rally is not too realistic now, they believe a moderate boost, stemming from the Fed's rate cuts and the $117 billion in tax rebates going into banks' accounts, is likely. On the other hand, looking at corporate profits, Citigroup analysts believe that predictions related to stocks' earnings figures are too high when taking the challenging market conditions into account.

Shares of wireless carrier Sprint Nextel Corp. (NYSE: S) are plunging after the company reported a large first quarter loss this morning. The company posted stronger-than-expected adjusted earnings, but this was not enough to reassure investors who pushed the stock down more than 3%.

Sprint Nextel posted a quarterly loss of $505 million, or 18 cents per share, compared with a loss of $211 million, or 7 cents, in the same period a year ago. Its quarterly numbers were dragged down by losses of more than 1 million subscribers and severance charges. However, excluding one-time charges, the company would have earned 4 cents. Analysts had expected earnings on that basis of only 2 cents per share, according to Thomson Financial. Revenue tumbled 7.5% to $9.3 billion, well below expectations of $9.4 billion.

Shares of French drug maker Sanofi-Aventis (NYSE: SNY) have been tumbling more than 5% in morning trading on news that a Swiss drug maker said it expects to receive approval to sell a generic version of Sanofi's anti-clotting agent Plavix.

History is repeating itself. After facing generic competition in the United States to its second-biggest product in 2006, Sanofi-Aventis is now dealing with a similar threat in Europe. Competition concerns came after Switzerland's Schweizerhall Holding AG announced it would launch a copy of the Plavix blood thinner that could be bought for a lower price. Schweizerhall said it expects German regulators to approve its generic version of Plavix, called clopidogrel.

Sanofi-Aventis's fears about generic competition are justified as the company had to fight against a similar situation less than a year ago. Back in 2006, Bristol-Myers Squibb Co. (NYSE: BMY), which develops the product with Sanofi, saw a big plunge in its sales after Canadian generics company Apotex Inc. launched a cut-price copy of the drug.

Shares of radio broadcaster Clear Channel Communications Inc. (NYSE: CCU) were slightly up in early trading after the company posted higher first-quarter profit boosted in part by gains in its outdoor advertising unit. Though, the company was not able to beat analysts' predictions as the weak economy put pressure on the overall advertising market.

Clear Channel Communications announced that its quarterly profit surged to $799.7 million, or $1.61 per share. The income figures were definitely something to cheer about. During its first quarter last year, the company had net income of $102.2 million or 21 cents per share. Excluding one-time items, earnings for the quarter would have been $0.19 per share. Analysts' forecast (which typically exclude one-time items) was for $0.21 per share, according to Thomson Reuters.

The media and advertising display company also said that quarterly revenue rose 3.9% to $1.56 billion, compared with $1.51 billion reported in the same period a year ago, helped by favorable foreign exchange rates; excluding the effect of the week dollar, revenue rose only 1%. Analysts had been expecting to see slower sales of $1.53 billion.

The world's third largest music company, Warner Music Group Corp. (NYSE: WMG), reported this morning a wider second quarter loss and suspended a quarterly dividend to strengthen its balance sheet.

Warner Music posted a quarterly loss of $37 million, dragged down by higher costs and lower compact disc sales. Analysts had expected a loss of 12 cents per share, and were disappointed to see the company report a loss of 25 cents per share.

Warner's quarterly revenue rose only 2% to $800 million compared with $784 million a year ago. The company attributed the revenue decline to its recorded-music segment whose sales climbed only 0.6% due to consumers' preferences for digital music. However, the drop in revenue could have been even worse if the recording company hadn't benefited from the weak dollar, Warner stated. Analysts expected revenue of $780 million, according to Thomson Reuters.

Transocean Inc. (NYSE: RIG), the world's largest offshore drilling contractor, reported its first quarter earnings this morning, and surprised Wall Street by posting a profit that more than doubled for the quarter.

The company said its quarterly profit jumped to $1.19 billion boosted by soaring crude oil prices. The offshore drilling contractor also benefited from strong sales from its acquired competitor GlobalSantaFe Corp. Going into today's earnings announcement, analysts had been expecting the company to post a profit of $3.33 a share, but Transocean surprised everyone by earning $3.80 a share during the quarter. This is a nice rebound from the same period last year when the the world's largest offshore oil driller reported earnings of $2.62 a share.

Looking at revenue, Transocean said its quarterly sales sales more than doubled to $3.11 billion, compared with $1.33 billion in the same period a year ago, helped by strong sales from GlobalSantaFe. Analysts, on average, were expecting the company show $3.05 billion in revenue, according to Thomson Reuters.

Shares of digital television provider DirecTV Group Inc. (NASDAQ: DTV) have been rallying in early trading as its earnings numbers for the first quarter were better than analysts had forecast. The company also announced its board approved an increase in its stock buyback program, raising it to $3 billion.

The company said its first-quarter profit rose 10% to $371 million, helped by higher subscriber additions. DirecTV was able to slightly come in above analyst estimates, with 32 cents per share compared to the forecast 31 cents per share. Compared to its first period last year, earnings were up, as the digital television provider came with earnings of 27 cents a share last year.

The nation's largest satellite-TV company posted a respectable growth of 17% for its first-quarter revenue, which jumped to $4.59 billion compared with $3.91 billion a year ago. This was above analysts' predictions for quarterly revenue of $4.47 billion, according to Thomson Financial.

Over the past year, we have been hearing a lot of bad news about investment banks and insurers. The slumping housing market, credit crunch and subprime mortgage troubles have been leading the headlines, so many of you are probably shying away from financial stocks as almost all the banks have been getting only bad publicity lately.

In the light of those worries about safe investments, CNNMoney is asking us to reconsider our opinions, claiming that there really are some quality stocks in these challenging financial times.

Berkshire Hathaway tops the list, mainly because of its CEO Warren Buffett, who has the experience of surviving previous recessions. While some investors may have impression that the company has a lot of tough times ahead, CNNMoney sees Berkshire with a lot of capital, which could be enough to steer it through the current economic storm. To support this argument, CNNMoney cites Keppler Asset management CIO Michael Keppler, who is convinced that Berkshire will be able to beat the difficult market.

Shares of D.R. Horton Inc. (NYSE: DHI), the largest U.S. home builder, were plunging in premarket after the company reported a large second quarter loss this morning. Its quarterly numbers were dragged down by the slumping housing market which forced the homebuilder to take hefty charges to write down the value of its inventory.

The company reported a loss of $1.31 billion, or $4.14 per share . The income figures were definitely nothing to cheer about. During its second quarter last year, the company had a profit of $51.7 million, or 16 cents per share, but that number was slashed this quarter as the homebuilder took pretax write-down charges of $834.1 million.

Wall Street analysts expected the company to have a quarterly loss of "only" 39 cents per share. So with the actual numbers, D.R. Horton is looking for a pretty bad day in today's session.

It has been a tough year for investors. We have been dealing with recession fears, housing market worries, high gasoline prices and a very weak U.S dollar. As much as we would love to say that the worst is behind us, we still could be in for some more rocky times ahead. So its best to try to figure out which stocks would be best to avoid for the time being.

Richard Gibbons wrote up a nice piece over on The Motley Fool that looks at some of the stocks that we would be wise to stay away from at this time. Regardless good or bad times, he is convinced there are always ways to make money, but in order to find the winners, it is also necessary to pull out the losers.

So how can we separate out the winners from the losers?

Gibbons seems to have a simple answer for this. He believes there is really no use in wasting our time trying to separate the winners from the losers as there are so many great cheap stocks that could offer us a chance to make money. Gibbons' advice is to not choose ugly and risky companies that could put our hard earned money at risk. To makes this clear, he uses a baseball analogy, expressing his options for the curve balls instead of the fastballs.

Tomorrow afternoon Walt Disney Co. (NYSE: DIS) will be answering Wall Street's questions about the strength of its US amusement parks when it reports its second quarter earnings.

The last time that Disney reported earnings was February 5, when the company topped analysts' estimates of 52 cents per share by a whopping 11 cents.

This time, analysts expect earnings of 51 cents a share on sales of $8.51 billion, compared with 43 cents and revenue of $8.07 billion a year earlier. Sales are expected to decline year-over-year as a result of the weak market conditions hurting Disney's theme parks, particularly its Walt Disney World in Florida.