You can also access all the Xbox LIVE recent news from the app, with all that's new in the world of videogames, cheats for games, and much more.
Another option you'll have in the app is the ability to change and modify your avatar. You can add all your favorite accessories or buy some new ones to make him even more handsome. And, of course, you can easily edit your profile.
Of course, the app requires an Xbox LIVE account to log in. Once you log in, you can do everything mentioned previously--send private Xbox messages, etc.
My Xbox LIVE is a very useful tool for Xbox 360 users, as it allows you to always stay connected to your account from your iOS device.