Just found this very nice site - http://projecteuler.net/ while searching for some nice math/SW problems to sharpen my knowledge.
I intend to practice through them, very nice job guys!! Very nice idea!!
One problem for a week, ~54 weeks a year, lots of problems to solve :).
Anyway it looks fun, there are around 332 problems as I write.
When I'll solve a problem, I'll post it here...