Are you already an SCJP?? HFSJ is more than enough I feel. However, I found this online material by Marcus Green also to be useful and this one by Mikalai Zaikin is also wonderful. [ January 01, 2007: Message edited by: Jothi Shankar Kumar Sankararaj ]
SCJP 1.4, SCWCD 1.4 - Hints for you, Certified Scrum Master
Did a rm -R / to find out that I lost my entire Linux installation!