I passed today with a score of 953. This was my second attempt after failing it just before xmas with 525. I would thoroughly recommend the following book to anyone struggling with the group policy side of this exam:
Amazon.com: Group Policy: Management, Troubleshooting, and Security: For Windows Vista , Windows 2003, Windows XP, and Windows 2000 (Mark Minasi Windows Administrator Library): Jeremy Moskowitz: Books
On my first attempt i failed mainly on group policy. After reading this book and setting up some labs using the examples in the book i was able to get my head round group policy and felt comfortable answering practice questions, knowing why the correct answer, was the correct answer.
The other materials i used were, sybex, testout and the sticky's from this forum. I also used a VMware lab consisting of a couple of dc's an xp client and freeSCO as a virtual router.