Microsoft have added some herbs and spices to their My Xbox Live iOS app, where there's a nifty feature that now allows you to use an iPad as a remote control for the Xbox 360. Version 1.6 of the app also adds a new Discover section that helps you find new and feature content to play on the Xbox 360.
In order to get going, you'll need to enable the Xbox Companion feature on your 360. This can be found in Settings, System, Console Settings, then Xbox Companion. After you've done this, you'll need to grab the app itself from the Apple App Store, and once you have it installed, just sign in with the same Windows Live account that you have linked to your Xbox 360, and that's it.
This the perfect app for those who don't want to always use the Xbox 360 controller, meaning you can continue to use your iPad for other things like Facebook or web surfing, periodically using it to control your Xbox 360.