The How To E-D-U Your How-To guide for Higher education has just published a list of 50 educational games, including 13 aimed at college or adult students.
http://howtoedu.org/2010/50-free-online-educational-games-that-are-more-fun-than-youd-think/
DawsonITE is a blog devoted to Educational Technology. It's compiled by Rafael Scapin, Coordinator of Educational Technology at Dawson College in Montreal (Canada).