Concurrent Port Scanner in Haskell

Tom Moertel wrote a very concise [port scanner in Haskell](http://blog.moertel.com/articles/2004/03/13/concurrent-port-scanner- in-haskell). I have never looked at Haskell in any detail, but this program seems pretty impressive. You wouldn’t be able to do a port scanner quite so neatly in most other languages. I guess I’ll have to put that on the long stack of things to look into in more someday.