Analyst upgrades:

• Jefferies upgraded VMware (NYSE: VMW) to Hold from Underperform on expectations June quarter revenue will be inline-to-slightly-better and negative revisions to September quarter revenue will not be as great as in the most recent two quarters. The firm raised its target on shares to $25 from $20.
  
• Citigroup upgraded Blue Nile (NASDAQ: NILE) to Buy from Hold on valuation following the recent pullback and believes expectations for Q2 are reasonable. The firm has a $50 price target on the stock.
  
• FBR Capital upgraded Bronco Drilling (NASDAQ: BRNC) to Market Perform from Underperform on valuation as it believes negative sentiment will ease. The firm raised its target on shares to $4 from $3.
• Unilever (NYSE: UL) was upgraded to Overweight from Neutral at JP Morgan.
  
• Posco (NYSE: PKX) was upgraded to Overweight from Equal Weight at Morgan Stanley.
  
• Gol Linhas Aereas (NYSE: GOL) was upgraded to Buy from Underperform at BofA/Merrill.

The earnings crunch begins in earnest this coming week, with companies from Johnson & Johnson (NYSE: JNJ) and PepsiCo Inc. (NYSE: PEP) to Southwest Airlines Co. (NYSE: LUV) and Harley-Davidson Inc. (NYSE: HOG) scheduled to report results for the quarter just ended. But with the ongoing turmoil in the markets, much attention is on the tech and financial sectors. This week will provide plenty to mull over on both counts.

Wall Street expectations for tech stocks are fairly optimistic. Analysts surveyed by Thomson Financial are looking for chip maker Altera Corp. (NASDAQ: ALTR) and software/service company iGate Corp. (NASDAQ: IGTE) to be the sector's biggest earnings gainers of the week. Altera is expected to report earnings of 30 cents per share (up 33.3% from a year ago) on revenue of $355.1 million. Altera had previously forecast flat sales for the quarter, and shares fell to a 52-week low last week. iGate is expected to report earnings of 14 cents per share (up 42.9%) on revenue of $55.6 million. India-based iGate recently spun off its Mastech consulting services. Shares are down 45.0% in the past three months, and also reached a new 52-week low last week.

San Jose-based Novellus Systems Inc. (NASDAQ: NVLS), on the other hand, is expected to report that net income tumbled 90.4% from a year ago to 4 cents per share, on revenue of $245.6 million. Novellus fell to a 52-week low early last week, and shares are down 44.5% year to date.

MOST NOTEWORTHY: Yahoo!, Goldman Sachs and Bankrate were today's noteworthy downgrades:

• Banc of America downgraded shares of Yahoo! (NASDAQ: YHOO) to Neutral from Buy as they believe that even if shareholders accept Microsoft's (NASDAQ: MSFT) offer, the regulatory hurdles are significant.
• Oppenheimer downgraded shares of Goldman Sachs (NYSE: GS) to Perform from Outperform as they believe the current valuation is not sustainable in a year when the company will probably deliver results that will not be substantially better than peers.
• Jefferies lowered its rating on Bankrate (NASDAQ: RATE) to Hold from Buy on valuation, as they believe the run-up in shares reflects expectations for strong Q4 results and guidance.

OTHER DOWNGRADES:

• SiRF Technology (NASDAQ: SIRF) was downgraded to Hold from Buy at Jefferies, to Market Weight from Overweight at Thomas Weisel and to Perform from Outperform at Oppenheimer.
• Goldman downgraded Posco (NYSE: PKX) to Sell from Neutral.
• Baird downgraded Associated Bancorp (NASDAQ: ASBC) to Neutral from Buy.

MOST NOTEWORTHY: The small-cap bank sector, Waste Connections, Warnaco Group and Intersections were today's noteworthy upgrades:

• Lehman upgraded the small-cap bank sector to Neutral from Negative as they expect the group to benefit from the decline in short-term interest rates and the steeping yield curve. The firm upgraded Associated Banc-Corp (NASDAQ: ASBC), Pacific Capital Bancorp (NASDAQ: PCBC) and Westpac Banking Corp (NYSE: WBK) to Equal Weight from Underweight.
  
• Friedman Billings added Waste Connections (NYSE: WCN) to its Top Picks list. The firm believes the company can outperform the group and overall market in an economic downturn.
  
• Warnaco Group (NASDAQ: WRNC) was upgraded to Overweight from Neutral at JP Morgan on valuation and growth potential.
  
• JMP Securities' checks indicate that Intersections (NASDAQ: INTX) is on track to meet EPS expectations for the quarter and is well positioned to beat their 2008 EPS estimate of 80c. The firm raised shares to Strong Buy from Outperform.

OTHER UPGRADES:

• Best Buy Incorporated (NYSE: BBY) and AutoZone (NYSE: AZO) were upgraded to Strong Buy from Outperform at Raymond James.
  
• The firm also upgraded shares of CBRL Group (NASDAQ: CBRL) to Market Perform from Outperform.
  
• JP Morgan upgraded Ruby Tuesday (NYSE: RT) and Plexus Corp (NASDAQ: PLXS) to Overweight from Neutral.
  
• Bear Stearns raised MFA Mortgage Investments (NYSE: MFA) to Outperform from Peer Perform.
  
• Goldman added Automatic Data Processing (NYSE: ADP) to its Conviction Buy List.