Quite a few people in the Toronto Lab are upgrading their certifications to the V9 level this summer, and I thought I'd pass on study tips for Exam 733 that I learned from the candidates this week.
1) There isn't a book available for Exam 733, nor is there one in plan. People recommend reading the V8 book by Roger Sanders to help prepare for Exam 733. If you work for IBM, remember that you can access this and other books through Books 24x7.
2) The two biggest additions to the 733 exam versus the 703 exam is .net and XML content. Of course, neither of these topics are covered to a great extent in the V8 book.
3) There are free tutorials for Exam 733, and it is recommended that you use these to prepare for at least the .net and XML areas, but perhaps reading all the 733 tutorials would be beneficial.
4) Not many of the people here take the assessment exams, but they are still valuable at helping you gauge your readiness to pass the exam.