This is my observation from the 2005 exams
Self study is the best way to attack, I find the courses not too useful
Grab some test exams (Pass4Sure, TestKing, ExamCollection)... google as well
Just go do the exam with free 2nd shot chance
70-431 was easy
I have heard
70-444 is easy
70-443 is the most difficult of all
Problem for 2008 certifications is that there aren't a lot of resources out there yet to utilize, even the books aren't out!