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The only book you need is one that teaches you how to use the EJB 3.1 spec. I recommend Enterprise Javabeans 3.1 by O'Reilly publishing.
When you've learned how to properly use EJB 3.0/3.1, the migration should not be so hard - but it will probably still be a lot of work. Depending on what the EJB 2.1 applications do there is no clear-cut steps to follow though; at least the entity layer will require a rewrite to get it to the JPA specification, its not as easy as putting some annotations and swapping out some code.