In a noble experiment in the economy of the Net, three books on J2EE and EJBs are available for downloading on The Server Side. The three books are:

• J2EE and XML Development by Kurt Gabrick and Dave Weiss
• Mastering Enterprise Java Beans Second Edition by Ed Roman
• EJB Design Patterns by Floyd Marinescu

Of course, the authors hope that you'll buy the book since most people prefer printed books to PDF and its more expensive to print it than to buy it. They're offering the complete book in PDF format as, essentially, advertising. This is apparently Ed Roman's idea. He did the same thing with the first edition of his book. I own that copy and found it to be a great book on EJBs. Since he's doing it again, he must have had a positive experience the first time around. Note: you will have to register with The Server Side to download the books.