Late July I took the 70-448 (SQL Server 2008, Business Intelligence Development and Maintenance) Beta Exam. It looks like the results are now being released being that I just received an email notifying me that I had passed. Woot woot!
My prep for the test was zilch. My real world experience was enough for me to pass. Cool eh? In all it took me about an hour and a half to go through the test.
I was initially hesitant in taking the exam, but certainly glad I did!
More info here: http://www.microsoft.com/learning/en/us/exams/70-448.mspx