Yesterday I passed the Sun Certified Business Component Developer exam. 
I had no hand-on experience with EJB 3.0. My experience with the Spring Framework helped me a lot to understand the principles of EJB. To prepare myself for the exam, I’ve read EJB 3.0 in Action. Although it is a good book, it contains a lot of information that isn’t required to know for the exam.
I also used the mock exams from Ethuware. The questions in the question bank are faithfully to the exam. The question viewer from Ethuware is a Java application, so I had no problems using it under Xubuntu. Below are some links to other resources that you can use for preparation:
