Analyst upgrades:

• Pacific Sunwear (NASDAQ: PSUN) was upgraded to Buy from Neutral by Pali Capital, which cited low expectations, new CEO experience, and compelling risk/reward for the upgrade.
• RBC Capital raised Aruba Networks (NASDAQ: ARUN) to Outperform from Sector Perform, based on increased visibility into wireless networking products.
• J. Crew (NYSE: JCG) was upgraded to Hold from Underperform by Needham after the company reported better-than-expected Q2 report and guidance.
• RBC Capital raised Lundin Mining (NYSE: LMC) to Outperform from Sector Perform, citing updated copper forecasts and valuation.
• Netezza (NYSE: NZ) was upgraded to Buy from Accumulate by ThinkEquity.
• Sanofi-Aventis (NYSE: SNY) was raised to Overweight from Neutral by JPMorgan.
• Williams-Sonoma (NYSE: WSM) was upgraded to Buy from Neutral by Goldman.
• Network Engines (NASDAQ: NENG) was raised to Buy from Hold by Cantor.

MOST NOTEWORTHY: Amazon.com (AMZN), Luminent Mortgage (LUM), Whole Foods (WFMI), Tenet Healthcare (THC) and Pediatrix Medical (PDX) were today's noteworthy upgrades:

• Bernstein upgraded Amazon.com (NASDAQ: AMZN) to Outperform from Market Perform, citing margins on 3rd party transactions that are close to eBay's (EBAY) and that the overseas merchants initiative will increase 3rd party units to 25% of sales. The move is expected to increase operating margins to 6.2% by 2011, above the previously expected improvement of 4.6% by the same time.

• JMP Securities said Luminent Mortgage's (NYSE: LUM) $64.9M emergency financing from Arco Capital may preserve some value for shareholders, and upgraded shares to Market Underperform from Sell.

• JP Morgan added Whole Foods (NASDAQ: WFMI) to its Focus List, and expects the Wild Oats (NASDAQ: OATS) acquisition to be a catalyst for shares.

• Deutsche Bank upgraded Tenet Healthcare (NYSE: THC) to Hold from Sell.

• Matrix USA raised Pediatrix Medical (NYSE: PDX) to Buy from Hold, citing valuation...

OTHER UPGRADES:

• AGL Resources (NYSE: ATG) and Atmos Energy (NYSE: ATO) were upgraded to Buy from Neutral at Calyon.

• Rowan Co (NYSE: RDC) was upgraded to Outperform from Peer Perform at Bear Stearns.

• Goldman raised O'Reilly Automotive (NASDAQ: ORLY) to Buy from Neutral.

• BMO Capital upgraded General Mills (NYSE: GIS) to Outperform from Market Perform.

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

MOST NOTEWORTHY: Palm, Inc (PALM), Reliant Energy, Inc (RRI) and Take-Two Interactive Software (TTWO) topped today's more notable downgrades:

• UBS cut Palm, Inc (NASDAQ: PALM) to Reduce from Neutral citing valuation. Bank of America downgraded shares to Neutral from Buy with an $18 target and considers the risk/reward less favorable at these levels.

• Bank of America also downgraded Reliant Energy (NYSE: RRI) to Sell from Neutral on valuation.

• Hillard Lyons cut Take-Two Interactive Software (NASDAQ: TTWO) to Neutral from Outperform.

OTHER DOWNGRADES:

• CIBC downgraded Jabil Circuit, Inc (NYSE: JBL) to Sector Performer from Outperformer following the company's disappointing outlook. Bear Stearns cut Jabil to Peer Perform from Outperform. BMO cut the company to Market Perform from Outperform.

• Friedman, Billings, Ramsey downgraded shares of FormFactor, Inc (NASDAQ: FORM) to Market Perform from Outperform to reflect increased risks in the logic market and long-term growth concerns.

• Matrix USA downgraded Knight Transportation (NYSE: KNX) to Hold from Buy.

• American Technology downgraded shares of Comverse Technology, Inc (NASDAQ: CMVT) to Neutral from Buy as the firm believes a retreat to the $17 range is likely given the company's disappointing margin trends.

• CL King cut Claire's Stores, Inc (NYSE: CLE) to Neutral from Strong Buy following the buyout offer.

• Goldman downgraded Atmos Energy Corp (NYSE: ATO) to Sell from Neutral and Liz Claiborne, Inc (NYSE: LIZ) to Neutral from Buy.

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