Have you downloaded Kinect Fun Labs for your 360 yet? It's a pretty cool collection of free tech demoes that use the Kinect. There's only a few toys to play with right now, but there are more on the way, and you can vote on which ones will appear in the game. Here are the candidates:
They're all pretty cool, and I hope they eventually all show up in the application, but, for me, I'd like to see "Keyboard Anywhere" appear in the Fun Labs, just so I could reenact my favorite scene from the movie Big. Make your voice heard, and vote right here.