If you like math at all, www.projecteuler.net/problems is worth a look. They pose math related problems that are intended to be solved programmatically. Once yo

If you like math at all, www.projecteuler.net/problems is worth a look. They pose math related problems that are intended to be solved programmatically. Once you've solved a problem correctly you are given link to the problem's forum page, where others people have posted their solutions. Whats truly great is that you are forced to solve the problem on your own, and then you can see how others did it, both in your chosen language(assuming it's a somewhat common language), but also a myriad of other languages.