I just found MC MCSE yesterday while looking for tips to pass my up and coming 70-284 exam. They offer:
Free Practice Exams - 44 free practice tests with over 4,300 total questions.
Free Study Guides - 110 study guides and tutorials to help you pass your exams.
Find Training Materials - Find the best books and training products for your studies.
Free Tech Magazines - Free subscriptions to ComputerWorld, eWeek and many more.
I took my first free test yesterday and got a 76% on it, passing, but not excellent. I find that most of the questions are well written but there where a few that needed some work. (Much like this blog I know!)