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.
Also a good book, but unfortunately a few version behind, is Ed Roman's Mastering EJB. The entire book is available online (free) at: http://www.theserverside.com/resources/book.jsp As you can see, it requires you to sign in to theserverside.com, but this site is excellent, so it's worth the time.