Microsoft announced of doing an Xbox LIVE Update Preview program for upcoming features such as Zune, Facebook and Twitter. You’ll need to visit Microsoft Connect site and sign in with your Windows LIVE ID that’s connected to your Xbox LIVE Gamertag.  Once you do that, you need to fill out the "Xbox LIVE Update Preview Sign Up" survey in order to be considered for receiving the Preview System Update. Just fill in the questions asked, and the Xbox team’ll then review all of the applications and if you’re selected we’ll send you an email notifying you of your acceptance in the program.  A couple of points before you head off to register.