It's pricey at $13 per download, but anyone who's played Splinter Cell Conviction on the iPhone can vouch for the quality of the Xbox 360 port.
It's basically the same game as what's on offer to iPhone users, except all in HD. You still play as Special Forces man Sam Fisher, with the end goal trying to recover your kidnapped daughter. There are 11 levels, with eight different locations, so it'll keep you busy for at least $13 worth of your time. [iTunes via Recombu]