Trika Harms has blogged about two sessions explaining Exchange 2007 certification program, it will be very interesting.
February 15, 2007 - English language Live Meeting. Rob Linsky (he's Microsoft Learning's cert product manager, you've probably heard him speak at an event or one of our other meetings...) will talk about the new exams, associated training, and implications for people planning to work with Exchange 2007 or who hold an MCSA: Messaging or MCSE: Messaging certification. As usual, we'll have 2 meetings with the same content to make it easier for people to attend worldwide and ask questions.
Here are the links:
Exchange 2007 Certifications (Session 1)
Exchange 2007 Certifications (Session 2)