Microsoft and PASS have announced that you can take a free Microsoft Certification exam. Visit the PASS Community Summit 2008 Microsoft Learning Certification Center Registration Site for more information.
I have just registered for one, so thier appear to still be free registrations available.
This program is only available for people who are going to PASS, and you have to take the exam at the PASS summit (which requires attentance to the summit).
See you at PASS.