Analyst upgrades:

• Oppenheimer upgraded Viacom (NYSE: VIA, VIA.B) to Outperform from Perform following the better-than-expected Q3 results to reflect an improving outlook for all the company's segments. The firm raised its target on shares to $36.
• Deutsche Bank upgraded C.R. Bard (NYSE: BCR) to Buy from Hold on expectations the company's underlying growth trends will improve. The firm raised its target on shares to $88 from $78.
• Wells Fargo upgraded Cognizant (NASDAQ: CTSH) to Outperform from Market Perform. The firm upgraded the stock after Cognizant reported better-than-expected Q3 results.
• Plug Power (NASDAQ: PLUG) was upgraded to Sector Perform from Underperform at RBC Capital.
• Digital River (NASDAQ: DRIV) was upgraded to Buy from Hold at Collins Stewart and to Overweight from Neutral at Piper Jaffray.
• Steris (NYSE: STE) was upgraded to Overweight from Equal Weight at Stephens.

Today was one of those up-days that might be a disappointment to many bulls because the gap-ups were not met by follow-on buying throughout the day. A better weekly joblessness report may have been muted by Asian central banks intervening to protect the US Dollar.

Here are today's unofficial closing bell levels:

Dow 9,786.79 +61.21 (0.63%)
S&P 500 1,065.31 +7.73 (0.73%)
Nasdaq 2,124.41 +14.08 (0.67%)

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Toyota Motors (NYSE: TM) is launching the first U.S. tests of its plug-in hybrid technology in two converted Prius hybrids. The test cars will run on nickel-metal hydride batteries for seven miles before a gas engine kicks in.

Although seven miles is nothing to rejoice about, other automakers are also developing plug-in vehicles that are more technologically advanced:

• General Motors (NYSE: GM) is developing the Volt plug-in, with hopes of reaching 40 miles of electric-powered travel with the new lithium-ion batteries.

• Ford Motor (NYSE: F) announced earlier this month it plans to give 20 Escape Hybrid SUVs modified as plug-ins to Southern California Edison for testing.

• Chrysler Group (NYSE: DCX) modified several Sprinter delivery vans as plug-ins, with one designated for newspaper delivery.