I completed my sharepoint certification series by passing the other Application Development certification paper 70-542 MOSS 2007 Application Develpoment.
It was relatively much easier then the previous paper (70-541 - WSS 3.0 Application Development).
I had done all the preperation from just one book, "Inside Microsoft Office Sharepoint Server 2007" by
by Patrick Tisseghem, this book contains everything you need to get your MCTS credentials for MOSS- Application Development.
Most of the questions were from following topics, i think you should go through following chapters really carefully before going for exam:
Chapter3- Customizing and Extending the Microsoft Office Sharepoint 2007 Search
Chapter4 - Working With Business Data Catelog.
Chapter7 - Integrating with Excel Services.
Chapter8 - Policy and Records management.
Belive me this paper is much more easier then Windows Sharepiont Services paper, and contains most of the questions from sharepiont settings and out of the box functionaliy.
All the best...