MasteringEjb is a complete e-book available from http://www.TheServerSide.com. Please note that you have to be registered at that site to get the book. -- SeshKumar
Webpage: http://www.TheServerSide.com
Third edition available for download
The 3rd edition was made available since early 2005. It is now over 800 pages and covers EJB2.1
See: EjbStarter