For those who actually haven't heard, Jessica has posted over on the Green Button how to sign up to beta test the next release of Media Center. If you were a member of the Windows Vista Media Center beta program, you do not need to re-apply.

To pre-empt any confusion, this is for Media Center only and is not for beta testing any v2 Extenders (sorry, no announcements for that at this time). You can continue to use your Extender while participating in the Media Center beta.