WhitePages.com is running a contest for best iPhone™ application and the best social networking application to use their newly made public people search/reverse phone/reverse address API. Winners will receive their choice of one 50" Pioneer® KURO™ PDP-5080 HD plasma TV or one 15" 2.4GHz Apple® MacBook® Pro.

The API is simple to use, though there's a CPAN module to make it even simpler. You'll need to register with WhitePages as a developer and apply for an access key to use the API and read the API terms of use.