On Gerry O’Brien’s blog you will find two beta exams invitations for SQL Server 2008 DBA 71-432 and SQL Server 2008 BI 71-448.
These exams will be available until July 31, 2008. They have opened the beta process up for those two exams to anyone who wants to attempt them.
The link to the information on Gerry’s blog is at http://blogs.msdn.com/gerryo/archive/2008/07/01/sql-server-beta-exams-extended-open-invitation.aspx