Symantec's Programming Competition
Symantec is having a programming competition for college students later this month. We had an dry run of this in January to make sure everything worked (two of my squash partners won first place). The prizes are quite substantial -- $10,000, $5,000, $3,000 for the top three entries. The contest runs for only 1 week, so the prize money is quite significant for a little investment of your time.
Good luck!