we're working on a community for developers where coders can practice their skills by solving programming puzzles. Coders can earn "skill points" (programming, knowledge of algorithms, etc) depending on the puzzles they solve and on how good their solution is. We currently support submissions in Java, C/C++, Perl, Python, Ruby, PHP, Fortran, Erlang, C#, Objective-C, LUA, Javascript, Scala, OCaml, Clojure and Common-Lisp.

You can check out the site at http://www.coderloop.com/

If you want to give it a try, I will appreciate any comment/feedback or suggestion you may have.

thanks!

- Federico Feroldi