Analyst upgrades:

• Oppenheimer upgraded Momenta Pharmaceuticals (MNTA) to outperform from perform as it finds the stock attractive ahead of FDA's decision on M-enoxaparin. The firm has a $15 price target on the stock.
• Wells Fargo upgraded Symmetry Medical (SMA) to market perform from underperform. The firm cited several factors for the upgrade, including valuation and its belief that Symmetry's customers have begun to deplete their inventories.
• Piper Jaffray upgraded Myriad Pharmaceuticals (MYRX) to neutral from underweight after the company announced Phase 2a date for Azixa. The firm has a $5 price target on shares.
• AvalonBay (AVB) and Mid-America Apartment (MAA) were upgraded to outperform from sector perform at RBC Capital.
• GSI Commerce (GSIC) was upgraded to overweight from equal weight at Morgan Stanley.
• FICO (FICO) was upgraded to equal weight from Underweight at Stephens.

Analyst upgrades:

• Barclays upgraded Best Buy (NYSE:BBY) to Overweight from Equal Weight and raised their target to $35 from $28 citing the company's earnings power and free cash flow generation.
  
• William Blair upgraded St. Jude Medical (NYSE:STJ) to Outperform from Market Perform following the company's Q4 results on valuation and the company's "steady growth."
  
• Wunderlich upgraded Liberty Interactive (NASDAQ:LINTA) to Buy from Hold as they believe debt concerns are overdone. The firm thinks that language in the proxy statement for the Liberty Entertainment hard spin suggests that cash and cash flow from the stub Entertainment tracker could be used to provide inter-company support to Interactive. The firm raised their target to $5 from $4.25.
• Lloyds TSB Group (NYSE:LYG) was raised to Buy from Hold at Citigroup.
  
• BB&T (NYSE:BBT) was removed from Goldman's Conviction Sell List.
  
• Patni Computer (NYSE:PTI) was upgraded to Buy from Hold at KeyBanc.

MOST NOTEWORTHY: Williams, Kilroy Realty and Dynavax Tech were today's noteworthy upgrades:

• RBC upgraded shares of Williams (NYSE: WMB) to Outperform from Sector Perform to reflect their expectation for three years of double-digit production growth in the company's E&P business.
  
• Kilroy Realty (NYSE: KRC) was upgraded to Outperform from Neutral as they believe the current valuation does not reflect the company's pure asset value.
  
• Oppenheimer upgraded shares of Dynavax Tech (NASDAQ: DVAX) to Outperform from Perform as they expect positive phase III results for Heplisav around mid-2008, driving shares higher.

OTHER UPGRADES:

• UBS raised Linear Tech (NASDAQ: LLTC) and Nalco Holding (NYSE: NLC) to Buy from Neutral.
  
• JP Morgan raised its rating on Verenium (NASDAQ: VRNM) to Neutral from Underweight.
  
• Discover (NYSE: DFS) was upgraded to Overweight from Underweight at Morgan Stanley.

MOST NOTEWORTHY: NutriSystem, Under Armour, CME Group, Air France ADS and Kilroy Realty were today's noteworthy upgrades:

• NutriSystem (NASDAQ: NTRI) was upgraded to Strong Buy from Buy at Broadpoint on valuation, as they believe all concerns are overdone.
  
• Think Equities upgraded Under Armour (NYSE: UA) to Buy from Accumulate on valuation.
  
• Wachovia upgraded CME Group (NYSE: CME) to Overweight from Market weight, as they expect fed income volumes to benefit from a more active Federal Reserve.
  
• Goldman added Air France (NYSE: AKH) to its Pan-European Conviction Buy List citing valuation following the recent sell-off.
  
• Citigroup upgraded shares of Kilroy Realty (NYSE: KRC) to Buy from Hold on valuation, as they believe concerns are overblown and the company's underleveraged balance sheet can drive growth.

OTHER UPGRADES:

• UBS raised SXC Health Solutions (NASDAQ: SXCI) to Buy from Neutral.
  
• Think Equities upgraded Symantec Corporation (NASDAQ: SYMC) to Accumulate from Source of Funds.
  
• DA Davidson & Co upgraded Texas Industries (NYSE: TXI) to Buy from Hold.
  
• Lehman upgraded Intersil Corporation (NASDAQ: ISIL) to Equal Weight from Underweight.
  
• Keefe Bruyette upgraded SEI Investments (NASDAQ: SEIC) to Outperform from Market Perform.

MOST NOTEWORTHY: Coca-Cola (KO), Fiserv, Inc (FISV) and several real estate companies were today's noteworthy upgrades:

• Coca-Cola (NYSE: KO) was upgraded to Buy from Hold at Citigroup, as the firm believes the company is addressing growth issues through recent acquisitions and notes that there are signs of stabilization in Japan.
• Fiserv (NASDAQ: FISV) was upgraded to Outperform from Neutral at Cowen based on valuation, upside from restructuring, new management's willingness to unlock value, and the potential possibility of a company sale.
• Deutsche Bank upgraded Apartment Investment and Management Co (NYSE: AIV), AvalonBay Communities (NYSE: AVB), Boston Properties (NYSE: BXP), Developers Diversified Realty Corp (NYSE: DDR), Kilroy Realty Corp (NYSE: KRC), Kimco Realty Corp (NYSE: KIM), Macerich Co (NYSE: MAC) and Simon Property Group (NYSE: SPG).

OTHER UPGRADES:

• RBC Capital upgraded Texas Roadhouse (NASDAQ: TXRH) to Outperform from Sector Perform, citing valuation and improved EPS outlook.
• Kenexa Corp (NASDAQ: KNXA) was upgraded to Outperform from Neutral at Credit Suisse, citing valuation and reduced risk from the BrassRing acquisition.
• Goldman Sachs added Foster Wheeler (NASDAQ: FWLT) added to its Conviction Buy List, citing valuation and leverage to energy infrastructure build and power.
• Goldman also added ProLogis (NYSE: PLD) to its Conviction Buy list, citing upside to FFO guidance, favorable domestic and international demand and above-average development margins.

Analyst summaries provided by TheFlyOnTheWall.com (subscription required).

MOST NOTEWORTHY: MGM Mirage (MGM), KLA-Tencor Corp (KLAC), Raytheon Co (RTN) and four apartment REIT's were today's noteworthy upgrades:

• Bear Stearns upgraded MGM Mirage (NYSE: MGM) to Outperform from Peer Perform following Kirk Kerkorian's intentions to purchase the Bellagio and City Center and also pursue strategic alternatives for the rest of the company.

• Matrix raised KLA-Tencor (NASDAQ: KLAC) to Buy from Hold, believing that growing demand for memory chips used in computers is leading to increasing revenues and profits.

• Cowen upgrade shares of Raytheon (NYSE: RTN) to Outperform from Neutral based on cash deployment potential from the RAC sale, pension EPS tailwind, foreign sales cycle, and strong execution.

• Wachovia upgraded shares of Archstone-Smith Trust (NYSE: ASN) and Apartment Investment and Management Co (NYSE: AIV) to Outperform from Market Perform and Equity Residential (NYSE: EQR) and UDR, Inc (NYSE: UDR) to Market Perform from Underperform...

OTHER UPGRADES:

• AG Edwards upgraded Marathon Oil Corp (NYSE: MRO) and Royal Dutch Shell (NYSE: RSA.A) to Buy from Hold.

• Stifel raised Citrix Systems, Inc (NASDAQ: CTXS) to Buy from Hold.

• RBC Capital raised Kilroy Realty Corp (NYSE: KRC), Boston Properties, Inc (NYSE: BXP) and Maquire Properties, Inc (NYSE: MPG) to Sector Perform from Underperform.

Analyst summaries provided by TheFlyOnTheWall.com (subscription required).