Bit of an odd one (quite specific but thought I'd share).
I purchased APB (All Points Bulletin) for the PC a few months ago. The company behind it went bust and the game shut down.
I purchased it from Steam but they were unable to offer a refund, so spotted a forum thread saying people had contacted EA directly and were being offered a current game to download for free! All they needed was the key and a screen grab of the game in my Steam loader.
Pushed my luck as didn't really see anything I liked, and they game me a 25% off voucher to use in the future - but could of had any of the current games for free (Battlefield Bad Company 2, Mass Effect 2 etc).