Analyst Upgrades

• Cree (CREE) and Rubicon Technology (RBCN) to buy from neutral at Merriman.
• Children's Place (PLCE) to outperform from market perform at BMO Capital.
• Lockheed Martin (LMT) to neutral from underperform at BofA/Merrill.
• Copano Energy (CPNO) to outperform from market perform at Morgan Keegan.
• Motorola Mobility (MMI) to neutral from reduce at Nomura.
• Parker-Hannifin (PH) to buy from hold at KeyBanc.
• Akamai (AKAM), ShoreTel (SHOR), AMB Property (AMB) and ProLogis (PLD) to buy from hold at Stifel Nicolaus.

Analyst Upgrades

• Oracle (ORCL) to outperform from perform at Oppenheimer.
• Accenture (ACN) to buy from hold at Jefferies.
• Advanced Energy (AEIS) and Applied Materials (AMAT) to overweight from equal weight at Barclays.
• Spreadtrum (SPRD) to buy from hold at Auriga.
• Healthcare Realty Trust (HR) and Tortoise Energy Capital (TYY) to outperform from neutral at RW Baird.
• Global Payments (GPN) to equal weight from underweight at Morgan Stanley.
• CBS (CBS) to buy from neutral at BofA/Merrill.
• Sonic (SONC) to outperform from neutral at Cowen.

Analyst Upgrades

• Wells Fargo upgraded Accenture (ACN) to outperform from market perform following the company's Q4 results, citing improved tone and increased visibility. The firm raised its target range for shares to $51 to $53 from $41 to $44.
• Macquarie upgraded FirstMerit (FMER) to outperform from neutral and has a $21 price target on the stock. The firm cites FirstMerit's strong fundamentals and competitive advantage for the upgrade.
• Macquarie transferred coverage on Marshall & Ilsley (MI) with a neutral from an underperform based on improved risk/reward.
• Eaton (ETN) was upgraded to overweight from neutral at JPMorgan.
• HSBC (HBC) was upgraded to conviction buy from buy at Goldman.
• Walgreen (WAG) was upgraded to overweight from equal weight at Morgan Stanley.

Analyst Upgrades

• Susquehanna upgraded Yahoo! (YHOO) to positive from neutral. The firm, which has a $19 price target on the stock, cites the steep decline in shares for the upgrade.
• UBS upgraded Time Warner Cable (TWC) to buy from neutral. The firm believes fears regarding FCC reclassification of broadband are "overblown" and that industry fundamentals are bullish. The firm has a $57 target on the stock.
• Keefe Bruyette upgraded Stifel Financial (SF) to outperform from market perform on valuation following the recent pullback in shares. The firm has a $64 price target for the stock.
• Boeing (BA) was upgraded to conviction buy from neutral at Goldman.
• RBC Capital upgraded Southern Union (SUG) to sector perform from underperform.
• Rubicon Technology (RBCN) was upgraded to outperform from perform at Oppenheimer.

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.

MOST NOTEWORTHY: SunPower, Evergreen Solar and Abbott Lab were today's noteworthy initiations:

• Citigroup believes SunPower (NASDAQ: SPWR) is faced with high cell production costs, its silicon cost and installation cost advantages are increasingly commoditized and finds the risk/reward even at current levels. Shares were initiated with a Hold rating and $105 target.
  
• Citigroup believes Evergreen Solar (NASDAQ: ESLR) faces significant financing requirements over the next few years, making it difficult to see a sustained period of EPS growth beyond the $1 range. The firm sees downside to $5/share. Shares were assumed with a Sell rating and $8 target.
  
• UBS started Abbott Lab (NYSE: ABT) with a Buy rating and $61 target. The firm is positive on Humira potential growth and expects Xience to drive vascular operating margins to positive.

OTHER INITIATIONS:

• Lazard initiated Cree (NASDAQ: CREE) and Rubicon Tech (NASDAQ: RBCN) with Hold ratings.
  
• BMO Capital started Smith & Nephew (NYSE: SNN) with an Outperform rating and $70 target.

MOST NOTEWORTHY UPGRADES:

• Potash Corp. (NYSE: POT) was upgraded to Buy from Neutral at Goldman based on the company's unprecedented sustainable pricing power.

MOST NOTEWORTHY DOWNGRADES:

• Resources Connection (NASDAQ: RECN) was downgraded to Equal Weight from Overweight at Morgan Stanley.

MOST NOTEWORTHY INITIATIONS:

• Credit Suisse believes Willbros Group Inc. (NYSE: WG) is well-positioned to capitalize on increased pipeline construction. The firm started shares with an Outperform rating and $46 target.
  
• CIBC, which said Rubicon Tech (NASDAQ: RBCN) is the leading sapphire supplier with the most advanced and highest quality substrate, views the company as uniquely positioned to leverage fast ramping LED volumes as new applications drive demand. CIBC initiated Rubicon with a Sector Outperformer rating and $23 target.
• Citigroup initiated El Paso Pipeline (NYSE: EPB) with a Buy rating and $28 target.
  
• Keefe Bruyette initiated Mercer Insurance (NASDAQ: MIGP) with a Market Perform rating and $19 target.
  
• Internet Brands (NASDAQ: INET) was initiated with an Overweight rating and $14 target at Thomas Weisel.