The Xbox LIVE app that released for iPhone last December is now available for iPad. The app isn't much more than a fun and convenient way to check out your Achievements, spy on your online friends, and play with your avatar, but I've enjoyed it nonetheless. It can also function as a remote for your Xbox. You can use it to turn your Xbox on and play, pause, rewind, and fast forward movies, TV shows, and other media.
Like the iPhone app, it's absolutely free.
In other news, my avatar has the most awesome T-shirt ever.