This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
A lot has changed--i fact much of the book has been rewritten. We use migrations, Ajax, mention REST, RJS, look at :through associations, and on and on. I'll let others who have both editions comment on whether the upgrade it worth it.