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.
I studied on JavaRanch when working on my SCJP and found that I really enjoyed the environment and the people here. I've been unable to find anything similar elsewhere.