Bengie Molina told Jon Heyman of SI.com that he doesn't intend to play in 2011 (Twitter link). Though the backstop has not officially retired at this point, a return to the field currently seems unlikely.
Molina's stance has changed since late May, when he said he'd be open to returning to the Giants. His former team could still use catching depth; San Francisco has been looking for help behind the plate since losing Buster Posey to a season-ending injury. The Padres and Red Sox were in contact with Molina earlier in the season and the Pirates have since begun searching for catching as well.
In 118 games for the Giants and Rangers last year, Molina hit .249/.297/.326. He hit at least 15 homers each season from 2005-09, before hitting just five long balls in 2010. The 36-year-old has played for the Angels, Giants, Rangers and Blue Jays in 13 Major League seasons.