I had a pligg site setup a while back for 'sci-fi' news. It was a fairly poorly implemented PHP application at the time and not nearly as clean and neat as Digg

I had a pligg site setup a while back for 'sci-fi' news. It was a fairly poorly implemented PHP application at the time and not nearly as clean and neat as Digg. However, that demo shows that they have been putting a lot of work into it since then.