Java.net had a link to the Javapedia
Java certification
page. There were some good links there. I was going to get my SCJP back
when I was a unemployable recent grad during the tech downturn, so I
bought a book to study, but I got a job before I got too deep into it.
I've recently been thinking about just getting it because it might look
good, and hey, it can't hurt. I've found that studying for the test has
helped me understand threading better, and given me some insight on stuff
I never use at work, like shifting. They really love bit shifting
questions.
Anyway, here's some links:
JavaPrepare Java
Certification Tutorial
JavaRanch SCJD Links
Sun's
100% Certified Java Coders: How To Get Certified propaganda
An SCJP 1.4
certification primer
SCWCD exam
info