A couple of months ago, we unveiled Visual Studio 10 at several conferences and provided attendees a copy of a VPC with Visual Studio 10. We also made the CTP available here.
Thanks to a lot of partners, customers, and hobbyists, we got a ton of great feedback on our bits and look forward to hearing more from the community. Unfortunately, the CTP came with a timebomb and expired at the end of 2008. We have not shipped another CTP since then so if you still want to play with the CTP VPC but have run into the expiration problem, follow the steps in Jeff Beehler's blog to disable the synchronization between your VPC and the host machine, then turn back the clock :)