What is it? It tracks the public timeline from twitter and picks up any links that get posted. It then follows each link to find final destination and then categorizes the content into blogs / video / images / audio. This project really shows what is possible using PHP if you know what you are doing.
Most of the work was done by another developer, Stuart Dallas as one of four that worked on the project together. It's written in PHP5 and uses only about 20 PHP files to get the job done. You can also check out the launch post over on tweetmeme's blog for more information on the service.