www.jobengine.com is usually a good source
classifieds.yahoo.com used to be an excellent way to be found, but they changed their availability posting routine some time ago and now it's just a hassle.
there are about a dozen or so "job" sites I'm sure you've heard of, here are just a few:
hotjobs.com
monsterboard.com
isearch.com (and subsidaries)
itjobs.com
if you need to take a break from your job-hunting:
ihatemyjob.com (some people need to get back to work and stop wasting company time creating web sites like this :p )
Stephen VanDyke
opido