For a number of years the International Conference on Functional Programming has held an annual competition. In this competition teams are asked in a very short period of time to build a the best piece of software that they can under tight time deadlines.

A link: ICFP 2005 Contest. To quote from it:

• The judges' prize goes to Dylan Hackers. The judges are happy to proclaim that the Dylan Hackers are an extremely cool bunch of re-hackers.
• First prize goes to KiebererAndXiaoTou. The judges are happy to proclaim that Haskell is the programming tool of choice for discriminating hackers.
• Second prize goes to Dylan Hackers. The judges are happy to proclaim that Dylan is a fine programming tool for many applications.
• Third prize goes to Combat-Tanteidan. The judges are happy to proclaim that Haskell is also not too shabby.

Seems like O'Caml, winner for many years of 1st/2nd/3rd prize is now nothing but a distant memory. (Thanks, g.!!)