People working in cubicles across the world waste their company's time and resources playing around on Digg all day.
Digg allows users to submit news stories, blog posts, and other useless Internet links and then other users are allowed to vote for or against the story. They either "digg" it or "bury" it.
The most popular Diggs end up on the front page of Digg.com...and then end up crashing because their servers can't handle the traffic.
I don't really know how this can help boost blog traffic, but I figured I'd throw a Digg button up to see if anything came of it. You can digg my main page or navigate to the individual posts (click on the post title).