Question: Do you know any online problem sets or contests that accept solutions in Haskell? I know only [El Judge](http://acm.mipt.ru/twiki/bin/view/ELJudge/WebHome), but unfortunately it has some problems with ghc, so any Haskell problem is rejected with "memory limit" resolution.

Answer: 
[Code Chef](http://www.codechef.com/) accepts Haskell.
[Project Euler](http://projecteuler.net)