• Java.1.5 Tiger -- A Developers Notebook (oreilly)
• Java2 Core Little Black Book
• 1000 Java Tips
• Latest SCJP (java 5) book by Kathy Sierra
• SCJP Exam Study Guide for J2SE 5 By Paul Sanghera ( Apress)
• Java Certification book (java 1.4) by Khalid A. Mughal
• TestKing Dump for SCJP (java 1.4)
• SCJP 
• A Complete guide to SCJP 
• Java Certi Study Notes
• Struts in Action  
• Java for the Web with Servlets, JSP, and EJB - A Developer's Guide to J2EE Solutions
• Custom Tags 
• SAX and DOM 
• XML schema and XSD
• XML for Java
• XML with Java 
• Java™ Servlet Specification
• JavaServer Pages™ Specification
• JSP Syntax card
• JSP Basics  
• O'Reilly - Java Server Pages - 2nd Edition By Hans Bergsten 

• Spring Reference

• Hibernate Reference
• Struts Hibernate Integration Tutorial
• Intro to Hibernate
• Hibernate Basics  
• Java Coding Standards (a must for every java programmer)  
• Test Exam -- Download this jar and use command below to run it on your system. this command will launch a exam window.
  D:\> java -jar Inquisition-0.12.jar
• Java-J2EE Interview Companion  -- Very well written *****
• 30 simple Java questions
• SCJP 5.0 Dump

 More is coming soon..