This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
O'Reilly Enterprise Javabeans 3.0, and EJB 3 In Action are the most popular titles. Personally, I used Enterprise Javabeans 3.0. But the most useful resource after either of those books, is Mikalai Zaikin's notes. I used those after reading through the EJB 3.0 book without taking any notes, and passed the exam no problem, everything had been referenced somewhere in the notes. Good luck!