if you have a gold xbox live account there are some free games on their way to you... this month is Fable 3 which you can only start downloading through your xbox

Free game of the month

there are also 2 free arcade games:

Harms way <-- co-op racing shooting game (one on a turret gun next to track shooting at enemy racers and other racing )

Doritos Crash Course <-- a "Wipeout" style game.