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Competitor Codility (funded by Seedcamp) who launched a couple of years ago was discussed quite extensively at the time:

http://news.ycombinator.com/item?id=1039140

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I had great fun doing the codility tests. Their site is great, allowing you to do the tests in the language of your choice.

Neither of these sites allows you to do the tests in the language of your choice =/

From their demo test:

Your test consists of 1 programming problem to be solved in Java, C++, C#, C, Javascript, Pascal, Perl, PHP, Python, Ruby or VB.NET,

That's correct. On both of these sites, I may use C, C++, C#, Java, Python, PHP, Ruby, or Perl. On Interviewstreet I may also use Haskell. On Codility I may also use Javascript, Pascal, or VB.NET. "The language of your choice" would probably include Algol-68, Lua, more than zero Lisps, D, and Brainfuck.

and on Coderloop you can also use Fortran, Erlang, Objective-C, Lua, Javascript, Scala, OCaml, Clojure and Common-Lisp :)

http://www.coderloop.com/home/guidelines

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