After studying for the last several months, I finally took the plunge today and passed!! Woohoo! It was a bit more challenging than I expected... I've had a year and a half experience with the VI3, but unfortunately not with all the features, which was evident during the exam. Still, I passed and am feeling pretty good, especially with VMworld right around the corner!
Thanks to all who have submitted recommendations for studying. Of course you can't beat real-world experience, but VMware's pdf's and the exam blueprint are also huge keys to success!
Brian