My favorite is the Job Board at Freelance Switch.
You can find tonnes of jobs there.  You can also place ads.

Also, Authentic Jobs has been good with quality listings.

www.krop.com, jobs.freelanceswitch.com, www.authenticjobs.com and www.jobs.37signals.com/jobs

Jobs.webdesignerwall.com  is pretty good for full time jobs, if you wanted freelance jobs you can goto jobs.freelanceswitch.com

Another good one is www.freshwebjobs.com. They also have a twitter and facebook page.

And dont forget these contest-based job board including http://www.99designs.com, www.crowdspring.com, and many more.

Design Jobs on the Wall
Smashing Jobs
DesignM.ag Job Board
ReadWriteWeb Job Board
Ars Technica Job Board
37signals Job Board
Krop
Freelance Switch Job Boards
Coroflot
Authentic Jobs

Www.creativehotlist.com