Analyst Downgrades for 3/9/2010... Amerigon (NASDAQ:ARGN) downgraded to Hold from Buy, $11 target, at KeyBanc... Cerner (NASDAQ:CERN) initiated as Market Perform at Wells Fargo... Cheesecake Factory (NASDAQ:CAKE) downgraded to Sell from Neutral, $20 target, at Janney Montgomery Scott... Cigna (NYSE:CI) downgraded to Underperform from Neutral, $38 target, at BofA/Merrill... Comerica (NYSE:CMA) downgraded to Market Perform, $35 target, at BMO Capital... Cullen/Frost (NYSE:CFR) downgraded to Hold from Buy at Wunderlich... Energy Conversion (NASDAQ:ENER) downgraded to Underweight from Neutral, $6 target, at JP Morgan... Evergreen Solar (NASDAQ:ESLR) downgraded to Neutral from Overweight, $5 target, at JP Morgan... First Solar (NASDAQ:FSLR) downgraded to Underweight from Neutral, $85 target, at JP Morgan... Linn Energy (NASDAQ:LINE) initiated as Market Perform at Wells Fargo... Textron (NYSE:TXT) downgraded to Neutral, $22 target, at JP Morgan... Toyota (NYSE:TM) downgraded to Hold from Buy at Standpoint Research... URS Corporation (NYSE:URS) downgraded two notches to Underperform, $53 target, at BofA/Merrill... W. R. Berkley (NYSE:WRB) initiated as Sell at Citigroup... Zoran (NASDAQ:ZRAN) downgraded to Hold from Buy at Collins Stewart...