This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
If you're going to purchase a new book, make sure it is updated to cover java 1.6 (not sure if any do)
if you can get a cheap second-hand book, at least 1.4 needs to be covered - there were major changes in 1.4