Enterprise Library has been released.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnpag2/html/entlib.asp
We have already used DataAccess and ExceptionManagement Building Blocks in projects. Feedback is very positive - we will test Enterprise Library, perhaps we can use it in future projects.
Another interesting Link:
http://msdn.microsoft.com/library/en-us/dnpag/html/WSFacadeLegacyApp.asp