Not sure how many of you have an iphone or Android but I'm a huge Goolge Fan Boy! I think the Xbox app has been live on iOS but it has officially arrived to Android as well and I LOVE it!
You can get the apps here:
iTunes ---> http://itunes.apple.com/app/id480914036?s=143455
Google Play -->https://play.google.com/store/apps/details?id=com.microsoft.xle