Perhaps due to Steam’s recent success (as noted in Boramis’ post), Microsoft is also implementing a weekly sale. And they kick it off well.
Braid is going for the more classic 800 point price point. This game was easily worth the initial $15, so $10 is a steal. Pick up one of the best games of last year (next to Left 4 Dead as Game of the Year), and probably one of the best all time (pun intended). Soon to be available on PC as well.