As a fan of David Münnich's notpr0n, I must say that the pythonchallenge website looks like a really cool spinoff and seems more approachable than Project Euler

As a fan of David Münnich's notpr0n, I must say that the pythonchallenge website looks like a really cool spinoff and seems more approachable than Project Euler. Edit: Not to mention you're not restricted to using Python, just like Project Euler. What's not to like?