Twitter users of TweetDeck, check this out. Facebook Connect and Seesmic Desktop is a dream application for the frequent status updater, group lover, and social media meme tracker. Has multiple columns that can be rearranged via drag and drop, customizable groups, Twitpic functions, etc.
"Welcome to fllwrs, the Twitter follower tracker. Would you like to see a record of who follows and unfollows you every day?
Would you like to get notified when someone unfollows you?
Use fllwrs to monitor changes in your Twitter followers over time and keep a history of followers that have been lost or added."