Analyst upgrades:

• Baird upgraded Adtran (NASDAQ: ADTN) to Outperform from Neutral based on valuation, new product cycles, and confidence in 2H08 results.
  
• Morgan Stanley upgraded shares of Repsol (NYSE: REP) to Overweight from Equal Weight as they believe the potential sale to Sacyr Vallehermoso SA could lead to a restructuring.
  
• Stanford lifted National Oilwell Varco (NYSE: NOV) to Buy from Hold citing valuation. In addition, the firm, which set a target of $70, thinks most of the drop in commodity prices is now over.
• Ryanair (NASDAQ: RYAAY) was raised to Hold from Sell at Societe Generale.
  
• Ann Taylor (NYSE: ANN) was upgraded at Piper to Neutral from Sell.
  
• Goldman added Illinois Tool Works (NYSE: ITW) to the Conviction Buy List.

Analyst downgrades:

• Argus downgraded shares of Constellation Energy (NYSE: CEG) to Hold from Buy post-close given the volatility in the stock as they can no longer recommend CEG until concerns over its capital and liquidity are resolved. Shares were also downgraded to Hold from Buy at Citigroup.
  
• Collins Stewart downgraded Lloyds TSB Group (NYSE: LYG) to Hold from Buy following the acquisition of HBOS (OTC: HBOOY) as they expect short-term weakness in the stock.

This post is part of a report entitled "Six-pack of technology favorites." You can read about the other top tech stock picks here.

"The semiconductor industry has been under pressure now for sometime, but one of the fastest growing businesses within semiconductors has been in programmable logic devices (PLDs)," notes wireless sector specialist Nikhil Hutheesing.

In The Forbes Wireless Stock Watch, he explains, "One of the top companies in this business is San Jose, California-based Altera (NASDAQ: ALTR). Here's his bullish review.

"These PLDs are chips that allow software developers to use inexpensive software tools to quickly develop, simulate, and test their designs. Then, a design can be quickly programmed into the chip and immediately tested in a live circuit.

"Unlike other chips, PLDs are based on re-writable memory technology. That means that if a designer wants to change the design on the chip, the device can be easily reprogrammed.

"Once the design is final, customers can go into immediate production by simply programming as many PLDs as they need with the final software design file. The result is that a final design can be completed much faster and less expensively than that of a custom, fixed logic device.

"While Altera also manufacturers other kinds of chips, it's the PLD business that could really boost the company's business. Eventually, Altera plans to replace the ASIC business entirely with PLDs.

MOST NOTEWORTHY: International Rectifier, Wolseley and ProLogis were today's noteworthy downgrades:

• Citigroup downgraded shares of International Rectifier (NYSE: IRF) to Sell from Hold after checks in Asia indicated LCD TV display weakness outside Sony/Samsung and signs of slowing China consumer demand.
  
• Morgan Stanley downgraded shares of Wolseley (OTC: WOSLY) to Underweight from Equal Weight to reflect a more negative outlook for the company's Nordic business and U.S. housing starts.
  
• Banc of America cut ProLogis (NYSE: PLD) to Neutral from Buy on long-term growth concerns given the economic slowdown.

OTHER DOWNGRADES:

• Polypore International (NYSE: PPO) was lowered to Neutral from Overweight at JP Morgan.
  
• Symantec (NASDAQ: SYMC) was downgraded to Market Perform from outperform at Friedman Billings.
  
• Frontier Financial (NASDAQ: FTBK) was downgraded to Underperform from Market Perform at Keefe Bruyette.

MOST NOTEWORTHY: Fluor, Forward Air and McDermott were today's noteworthy upgrades:

• Citigroup upgraded shares of Fluor (NYSE: FLR) to Buy from Hold to reflect the company's strong performance and backlog in Q4 and raised their target to $190.50 from $158.
  
• Baird upgraded Forward Air (NASDAQ: FWRD) to Outperform from Neutral citing near-term growth initiatives that are gaining traction.
  
• Citigroup also upgraded shares of McDermott (NYSE: MDR) to Buy from Hold to reflect the company's strong Q4 performance and rising commodity prices.

OTHER UPGRADES:

• RBC Capital upgraded Digital Realty (NYSE: DLR) and ProLogis (NYSE: PLD) to Top Pick from Outperform.
  
• Credit Suisse raised China Unicom (NYSE: CHU) to Outperform from Neutral.
  
• Tyson Foods (NYSE: TSN) and Oracle (NASDAQ: ORCL) were upgraded to Buy from Neutral at Merrill Lynch.

MOST NOTEWORTHY: Morgan Stanley, AstraZeneca and Lowe's were today's noteworthy downgrades:

• Goldman Sachs downgraded shares of Morgan Stanley (NYSE: MS) to Neutral from Buy as it believes declines in capital markets and commercial real estate, coupled with additional investment writedowns, will impact near-term earnings.
  
• AstraZeneca (NYSE: AZN) was lowered to Neutral from Overweight at HSBC. The firm expects further negative pressure on shares with the 30-month stay on an FDA approval of generic versions of low dose Seroquel set to expire in April 2008.
  
• Citigroup downgraded Lowe's Companies (NYSE: LOW) to Hold from Buy as it believes a Q4 miss and 2008 guidance will likely pressure shares in the near-term.

OTHER DOWNGRADES:

• Friedman Billings downgraded TiVo (NASDAQ: TIVO) to Underperform from Market Perform.
  
• Merriman downgraded Mentor Corp (NYSE: MNT) to Neutral from Buy.
  
• Goldman removed ProLogis (NYSE: PLD) from its Conviction Buy List.

MOST NOTEWORTHY: UBS AG, ProLogis, AMB Property, Navteq and PDL BioPharma were today's noteworthy upgrades:

• JP Morgan upgraded shares of UBS (NYSE: UBS) to Neutral from Underweight as they believe the company can start fresh after yesterday's pre-announcement.
  
• Banc of America upgraded shares of ProLogis (NYSE: PLD) and AMB Property (NYSE: AMB) to Buy from Neutral to reflect their positive outlook on global industrial REITs and believes they are positioned to benefit from global demand for industrial space.
  
• Navteq Corporation (NYSE: NVT) was upgraded at Deutsche Bank to Hold from Sell to reflect the acquisition by Nokia Corporation (NYSE: NOK).
  
• Wachovia raised shares of PDL BioPharma Inc (NASDAQ: PDLI) to Outperform from Market Perform following the CEO resignation and potential sale of the company.

OTHER UPGRADES:

• Thor Industries (NYSE: THO) was upgraded to Buy from Gradually Accumulate at Soleil.
  
• Gabelli upgraded Hershey Company (NYSE: HSY) to Hold from Sell.
  
• Forest Laboratories (NYSE: FRX) was upgraded at Citigroup to Hold from Sell.
  
• Roth Capital upgraded Conexant Systems (NASDAQ: CNXT) to Hold from Sell.

MOST NOTEWORTHY: Sonic Automotive (SAH), Hawaiian Electric (HE), AstraZeneca (AZN), AMB Property (AMB) and ProLogis (PLD) were today's noteworthy downgrades:

• Goldman downgraded Sonic Automotive (NYSE: SAH) to Neutral from Buy on valuation.

• Hawaiian Electric (NYSE: HE) was cut to Underweight from Equal Weight at Lehman based on valuation and the regulatory environment.

• AstraZeneca (NYSE: AZN) was downgraded to Equal Weight from Overweight at MorganStanley based on the reduced buyback, the $1.6B restructuring charge and potential for Nexium generics in Europe.

• Citigroup cut AMB Property (NYSE: AMB) and ProLogis (NYSE: PLD) to Sell from Hold citing the tight capital markets and the impact on costs for the downgrades...

OTHER DOWNGRADES:

• JP Morgan downgraded D.R. Horton (NYSE: DHI) to Neutral from Overweight.

• Roth Capital downgraded Century Casinos (NASDAQ: CNTY) to Hold from Buy.

• Keybanc downgraded shares of Diebold (NYSE: DBD) to Hold from Buy.

• DA Davidson cut Sunrise Senior Living (NYSE: SRZ) to Sell from Neutral.

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

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).