Unfortunately I didn’t know about this site until recently, so I’m only using it for the one exam (70-294).

http://www.vtc.com

For only $30 per month, you get full access to their video training catalog including all of the major Microsoft exams. There’s also heaps of other courses including Photoshop, programming, Cisco and heaps of others. Even better, its a simple monthly fee. Once you’ve completed the certs your after you can just cancel the account.

The videos are good quality, broken down into chapters and includes slide-show style presentations and lab senarios. In conjunction with the MS Press books there’s no reason to fail!