Microsoft is currently accepting applications for beta testing the Xbox 360 Spring 2011 update. Selected participants (multiple thousands of participants) will get early access to the system update as well as a free copy of Halo: Reach in order to test the new Xbox 360 disc format.
You will need to meet the following requirements:
1.Live in the United States
2. Have an Xbox 360
3. Have an Xbox Live account (Gold or Silver) -- preference given to Gold accounts
More info here> http://majornelson.com/2011/03.....e-preview/
*Due to disc distribution limitations, this beta it will be limited to residents of the United States only.