I recently took the MS 70-630 Certification exam and passed it.
Here are some resources that I used to prepare for this exam:
Topics covered in the exam
I found the "MCTS: Microsoft Office SharePoint Server 2007 Configuration Study Guide: Exam 70-630" particularly useful. It covers all the exam topics and provides "to-the-point" info. This is a "must have" book for preparing for this exam. Also, I would definitely recommend completing the BDC, Excel Services, and Enterprise Search Virtual Labs. In addition to the above resources, hands-on experience with MOSS 2007 is a necessity to pass this exam.