I've picked up a few in the last couple of weeks
XBLA
SFII.... HD Love it
A Kingdom for Keflings- Fun game, which is very laid back. I like playing to wind down after COD/GOW
Community Games
Word Soup- Big fan of word puzzles/ word scramble games. One of the best of the Community Games
Easy Golf- Love the fact you can build your own courses for the games, and then play them with friends online