I've been using SCWCD Exam Study Kit by Deshmukh and Malavia. I assume that this book is not fit for the new exam, but that problem should be solved soon enough when Kathy and Bert have finished there Head First book on jsp and servlets (my voucher unfortunately expired before the release).
The things that I found hardest on the exam where related to web.xml and all strange naming conventions (or rather lack of). If you are going for this exam and want high score, make sure that you speak web.xml tags as if it had been your first language. ;-)