Dresser-Rand (NYSE:DRC) upgraded to Buy from Neutral at Global Hunter... Enbridge Energy Partners (NYSE:EEP) upgraded to Outperform from Market Perform at Morgan Keegan... EnerNOC (NASDAQ:ENOC) initiated at Outperform at Wells Fargo... Focus Media Holding (NASDAQ:FMCN) initiated at Outperform at Macquarie... Kla-Tencor (NASDAQ:KLAC) upgraded two notches to Hold from Sell at Citigroup... Pentair (NYSE:PNR) upgraded to Buy from Neutral at Janney Montgomery... Potash (NYSE:POT) upgraded to Buy from Hold at Citigroup... Sina (NASDAQ:SINA) initiated at Outperform at Macquarie... Tennant (NYSE:TNC) upgraded to Buy from Hold at Needham & Co... Time Warner Cable (NYSE:TWC) upgraded to Buy from Hold at Citigroup...