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.
Head First Servlets & JSP is an excellent book for learning servlets. It only assumes you know Java, nothing else. It explains everything you need to know about the container and the servlet lifecycle before you start coding. I highly recommend it.