IMVironments - the little background themes for Yahoo Messenger - have gotten Yahoo in a lot of trouble. The company's lost a patent infringement case that concerns them, and as a result, is supposed to pay a subsidiary of Acacia Research Corporation $12.4 million. With no offense intended to Yahoo's lawyers, it's safe to say that the odds never favored a Yahoo victory; a few details strongly imply that Acacia's a patent troll. Take, for example,