This morning I rolled the dice and wrote the 70-565 exam, Pro: Designing and Developing Enterprise Applications Using the Microsoft .NET Framework 3.5.
It was markedly different than the Fundamentals (70-536) exam that I sweated over last week.
This exam targeted the sort of knoweledge and instinct that you accumulate by building a variety of diverse systems on a MS platform. If you have a wide breadth of experience, and have been keeping up with current techniques and technologies, then you likely have a pretty decent shot at passing this exam.
I can't offer any suggestions on study materials to use on this one, for obvious reasons. I'd suggest reading over the exam summary, and if you find yourself thinking, "... done that... done that... done that... meant to do that.... done that... who doesn't do that? ... " then I'll bet you're ready for this one.