I installed the Microsoft SQL Server 2008 yesterday. The setup required me to get rid of the Express editions of Visual Studio 2008 as they weren't SP 1, but I didn't mind as I had the SP1 on Visual Studio Team Suite 2008. I also had to get rid of SQL Server 2005 Express Edition for the installation to continue. Oh well, out with the old stuff and in with the new.
The certification exams associated with MS SQL Server 2008 are 70-432 for DBAs and 70-433 for database developers. The one-exam certification makes it really attractive especially since they aren't forcing DBAs to turn into developers or vice versa to prepare for the exams.