This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
You can buy or have a look at 'Mastering EJB' by Ed-Roman. This is a good book with lot of info related to EJB and also has some decent examples. You can download the book for reference from theserverside.com 'Head First EJB' by the Kathy Sierra etc is also good book for a starter.