Check out
TopCoder. They hold algorithm competitions several times a month and have a rating system for those who compete. If you do well, it might be worth putting your rating on your resume. Also, the occassional tournaments pay out some hefty cash prizes. Even if you don't want to participate in the competitions, they have a decent set of practice problems. If you decide to register and compete, please put "Code-Guru" in as the referring member.

[ November 01, 2004: Message edited by: Layne Lund ]