For those of you thinking of taking the SCJP test my experiences are:
1. The Marcus Green Web site is a good start. http://www.jchq.net/
2. ucertify is tougher than the real test but worth the bucks to see the ticky
questions Sun come up with: http://www.ucertify.com/
3. The complete Java 2 Certification study guide. Roverts, Heller, Ernest
http://www.amazon.com/exec/obidos/ASIN/0782128254/ref=bxgy_sr_text_a/103-863
6019-2515808

Perhaps this seems enough but there's a lot of material to be discovered! Good luck.