I have read a post to this list from about a year ago, considering Haskell support on online judges, like acm.uva.es. I think our online judge (a system for the verification of the correctness of submitted programs, which solve problems selected from a repository) might interest you. The Sphere Online Judge (SPOJ) is available at http://spoj.sphere.pl, and supports solutions written in 20 different programming languages including Haskell. We would like to invite you to solve problems at our server. At present, nearly half of the rapidly expanding problemset (currently more than 60 tasks) can be solved using functional languages easily within the time-limit. It is possible to add tasks dedicated to functional programming and the development team will be glad to cooperate if you are willing to create some new interesting problems. With best wishes, Adrian Kosowski, Michal Malafiejski, Tomasz Noiński, Gdansk University of Technology, Poland