SP2010 beta 2, finally it is here!
But be advised, currently you should install this on Windows 2008 and NOT Windows 2008 R2!.
during the configuration of the services you will get an error relating to "allowInsecureTransport".
This is fixed by a HotFix for WCF. But the Windows 2008 R2 version is not yet available.
Read more here: http://blogs.msdn.com/opal/archive/2009/11/16/installation-notice-for-sharepoint-2010-public-beta.aspx