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.
Several books on JDK 1.5 (Java 5) but none on the 1.5 Certification exam.
Two I can recommend are the one by Peter Van Der Linden (its gotta be good as it mentions me) and the 2nd Edition of Head First Java. (I don't actually have a copy but I keep reading it in Borders )...
Sierra and Bates are furiously working on a new version of their Certification book for the 1.5 exam, and I am working on material myself.