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.
I would look at the developer exam, SCJD. It will follow-up your experiences learning core java with a practical, "hands on" project that will help put your skills to use developing a "real world" type java application.