I scored an 87 on part I. Yipee!
I think some of the prep came from recently passing IBM 287 which required a large amount of JSP/Servlet/EJB knowledge.
I thought that the Cade and Roberts book was helpful but didn't stand alone; one needed to have some EJB experience along with readings in Design Patterns (GoF book) and general OO to really be ready.
Allen and Bambara book was helpful to a point, however, I realized I was approaching "ready" for this test when I started finding errors in the book. I was rather disappointed in that, but had to ignore it and focus on the Cade & Roberts book.