Spikethevote.com is an application which aims to game Digg and get your link on the front page. It’s up for sale on Ebay at the moment.
From a review at Tech Crunch:
A link on the front page of Digg means tens of thousands of visitors to your site, so it’s no surprise that people are setting up systems to game it. The newest attempt is called Spike the Vote. It’s easy to wag your finger at them and say “shame on you,” but Digg is going to have to deal with threats like this if the content on its front page is going to mean anything.