I found this contest on WestHost.com today for PHP coding. You submit your best PHP code and it's judged on utility, creativity, efficiency, and readability. There will be 10 winners and the prizes include books from PHP Architect, software from Zend, and a System 76 Lemur Ultra Thin laptop.
The contest goes on until March 15th. You can check out the rules and submit here:
After you submit you can go and rate everyone's code too.