Thanks ooo for telling me that he noticed a new Beta program in his Contact Info page called "VS Customer Preview" that can only refer to the Microsoft Virtual Server Beta which we reported on here a week ago. People were invited to sign up at BetaPlace using the guest ID: vscp. It"s uncertain if Microsoft are still considering candidates -but you can try if interested.
Another beta is also out of the starting blocks, thats the PC Satisfaction Trial which we reported on here, and today a couple of posts down from this one. The guest ID is still open for sign-ups here at BetaPlace using the guest ID: PCSATTRIAL. Neowin has also obtained a download link for the web install of PC Satisfaction Trial, but its pretty useless because you need to be admitted so you can download the setup files and sign in with your passport (much like MSN Messenger it would seem).