Manning has made available 9 chapters of EJB 3 In Action as part of MEAP Release. Draft version of chapter 1 “What’s what in EJB 3" is available for free. Take a look at this at http://manning.com/panda/.
You will probably like the beginning story of an Indian boy named Sadhu and it's comparison with EJB’s incarnations. You can access the chapter at http://manning.com/panda/.