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.
My main preparation was reading Manning SCWCD Exam Study Kit 2nd, Mikalai Zaikin's Study Note, Jothi's Note and trying mock exams from Enthuware's JWebPlus. Also, I often read this lovely forum and post some questions if I have some doubts.