The Back to the Future Blu-Ray set has re-ignited interest in the trilogy and one of the more interesting things to pop up on the web as a result is the entire video biography of Biff Tannen from the alternate 1985. You might recognize this from the scene in Back to the Future part II when Marty finds himself out in front of the Biff Tannen Museum.
And as a bonus, here's a video from a stand-up routine performed by Biff's portrayer, Thomas F. Wilson. It's a short song that answers all the questions he regularly gets about Back to the Future.