Okay, it's actually a tech demo, but indie studio Pixel Ninja's Zombie Holdout is still pretty neat. Built using OpenNI and Unity, the demo features a lone survivor fighting off hordes of zombies with a pair of pistols. Both hands aim independently and, honestly, the demo has given us a better appreciation of the difficulty inherent in dual-wielding (Lara always made it look so easy!).
Pixel Ninja will release a downloadable version of the Zombie Holdout Kinect demo on March 7 for PC.
From the 123Kinect article: "From what I can tell, the first PC game for Kinect that is NOT a hack, will have a demo available to download on March 7th. Although it a tech demo, there is potential it will become a full fledged game. It’s titled Zombie Holdout by an Indie developer named Pixel Ninja. I’m not sure if they have released anything yet as the company has little details publicly known, but this could be their first entry into the gaming world."