This is a pretty cool site: Project Euler <http://projecteuler.net/>.
It's a list of problems that can't be solved using mathematical cleverness alone - they require programming. After you solve a problem, you then get access to the list of previous solutions. The first one - "Add all the natural numbers below one thousand that are multiples of 3 or 5." - is just a Python one-liner. The second - "Find the sum of all the even-valued terms in the Fibonacci sequence which do not exceed four million." It's fun looking at the previous solutions in all kinds of other languages. Really shows the elegance of Python. It reminds me somewhat of JavaBat <http://javabat.com>. There was some discussion earlier about doing something similar in Python? - Michel
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