Wall Street's optimism in last week's preview about the earnings of tech stocks wasn't misplaced, as there were many more positive surprises than negative ones among the stocks we looked at. This week will bring plenty more data for investors in and watchers of the sector to mull over. Apple Inc. (NASDAQ: AAPL), AT&T Inc. (NYSE: T), and Microsoft Corp. (NASDAQ: MSFT), for example, are expected by analysts surveyed by Thomson Financial to post modest earnings gains from a year ago, to $1.11 per share (on $8.1 billion in sales), $0.72 per share (on $31.3 billion in sales), and $0.47 per share (on $14.8 billion in sales) respectively. All three of these companies ended the week closer to their 52-week lows than highs, and analysts on average consider them each a buy.

Here's a look at some of the week's biggest expected earnings gainers and decliners in the sector:

• Baidu.com Inc. (NASDAQ: BIDU): $1.25 per share (+44.0%) on revenues of $134.7 million (+103.2%)
• Broadcom Corp. (NASDAQ: BRCM): $0.44 per share (+38.6%) on revenues of $1.3 billion (+33.8%)
• QLogic Corp. (NASDAQ: QLGC): $0.31 per share (+29.0%) on revenues of $170.0 million (+21.2%)
• FLIR Systems Inc. (NASDAQ: FLIR): $0.32 per share (+28.1%) on revenues of $275.2 million (+44.0%)
• Juniper Networks Inc. (NASDAQ: JNPR): $0.30 per share (+26.7%) on revenues of $927.4 million (+26.2%)
• Waters Corp. (NYSE: WAT): $0.75 per share (+17.3%) on revenues of $391.6 million (+11.1%)
• Flextronics International Ltd. (NASDAQ: FLEX): $0.29 per share (+17.2%) on revenues of $8.7 billion (+57.3%)
• EMC Corp. (NYSE: EMC): $0.19 per share (+10.5%) on revenues of $3.7 billion (+12.9%)

MOST NOTEWORTHY: Some of today's more notable downgrades include Accredited Home Lenders Holding Co (LEND), RadioShack Corp (RSH) and Shuffle Master, Inc (SHFL):

• Keefe Bruyette cut Accredited Home Lenders Holding Co (NASDAQ: LEND) to Underperform from Market Perform, saying the downturn in the subprime market raised liquidity concerns on the stock.

• RBC downgraded RadioShack Corp (NYSE: RSH) to Underperform from Sector Perform, explaining that cost cutting measures are largely complete and margin expansion estimates are too aggressive.

• Shuffle Master Inc (NASDAQ: SHFL) was downgraded to Hold from Buy at Jefferies, citing the lack of visibility into the company's placements and potential IP protection risk in Macau. Shuffle Master was also cut to Underperform from Peer Perform at Bear Stearns following the company's announcement that it will have to restate prior financial results.

OTHER DOWNGRADES:

• UBS downgraded shares of Marvell Technology Group (NASDAQ: MRVL) to Reduce from Buy, citing risks to HDD demand given upcoming launches by Apple (NASDAQ: AAPL) of NAND-based Video iPods. The analyst expects HDD weakness to phase in and not collapse, but sees limited growth in the HDD segment.

• Roth Capital cut WPT Enterprises, Inc (NASDAQ: WPTE) to Sell from Hold, citing valuation, reduced earnings expectations and execution risk related to bringing the online gaming business in house.

• China Eastern Airlines Corp (NYSE: CEA) was downgraded to Underweight from Equal Weight at Morgan Stanley.

• China GrenTech Corp (NASDAQ: GRRF) was downgraded to Neutral from Positive at Susquehanna.

• RBC cut Nova Chemicals Corp (NYSE: NCX) to Sector Perform from Outperform.

• Sandler downgraded shares of OceanFirst Financial (NASDAQ: OCFC) to Hold from Buy.

• Citigroup downgraded Dollar General Corp (NYSE: DG) to Hold from Buy.

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