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Re:Don't write on the whiteboard by psykotic on Tuesday January 10, 2012 @09:16PM (#3450172)
You left out Berkeley's annual programming contest:

http://www.cs.berkeley.edu/~hilfingr/programming-contest/

The bottom of the page also has links to problem sets from a bunch of other contests.

Re:Don't write on the whiteboard by reledi on Wednesday January 11, 2012 @12:43AM (#3450603)
Thanks, I was unaware of that one.
Re:Don't write on the whiteboard by nabb on Wednesday January 11, 2012 @03:58AM (#3450957)
I'd add TopCoder and Codeforces to the list:

http://community.topcoder.com/tc

http://codeforces.com/

Both of these sites run a few algorithm competitions every month.