The Microsoft Windows 2008 Server Administrator books arrived about a few weeks ago. Started off reading the 70-642 book first. Some people recommended doing 70-640 first.
Just about finished the 70-642 book and have planned on attempting the exam 19th July, assuming I am confident when the time rolls around.
Wish me luck
EDIT: Pulled exam forward a week. Got sick of reviewing. Now booked for 12th July.