Q: What do I need to play the Halo 3 Public Beta?
A: You will need an Xbox 360 with an HDD, an Xbox Live Gold account, a broadband internet connection and a method of entering the Halo 3 Public Beta (typically a specially marked copy of Crackdown).
Lasts for 3 weeks, might even get Crackdown if I'm not *ahem* up and running as previous during this time.