Another milestone for Windows Server code name "Centro" occurred this afternoon with the official signing off of the CTP (5241) build. The CTP builds on the foundation established in Beta 1 while moving into new areas such as enabling legacy Active Directory domain joins, including Windows Server 2008, etc. If you're in the TAP or TechBeta you should be able to download it from connect.microsoft.com within a few hours. Please test it, push it, break it and then file those bugs! We looking forward to hearing from you.
We're on the road to Beta 2...
For anyone interested in joining the "Centro" beta program, go to http://connect.microsoft.com, click on Invitations, sign in with your Windows Live ID (Passport ID) and enter the following invite ID; Extr-GHBC-JCJM. Microsoft will send an email to you from MsftConn@microsoft.com once they have reviewed your application. (via SBS, Centro, WHS Community Lead Blog).
Source:? Kent Compton's Blog
Windows Server Centro, CTP, Previews