Project Euler

I saw this talk on youtube by Randall Munroe, author of the webcomic xkcd, and he mentioned a site called Project Euler, where mathematical problems of varying difficulty levels are presented, usually meant to be solved with the help of a computer program. It's a great way to develop programming skills in the language of your choice, and a great way for me to pass the time before I go back to USC for bowl week. Check it out!