I am on my way to SCBCD, too, and will take it soon.
What can I say about good book for preparance?
If you will choose Head First EJB - you will never fail. It's good, very good.
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*Started with Head First EJB....Must/Essential/Needed.ANy way u want to take it. *Read specs after u are done with the Book.Specs are the place where SUn would put questions from. The link given earlier is very good place for other resources . Hope it helps