Graphs and Stats
Twitterless tells you who stops following you and graphs your follower history over time, making this info available in a variety of useful views.
Follower Filters and Searching
See all of your followers or friends on one page. Filter them by keywords in their description, sort them by a variety of attributes, and search for terms in their tweet history.
Follower Locations
See where your followers are in the world on a Google map. Find out where your follower base is strongest.
Groups
Add some sanity to the Twitter cacaphony! By organizing your friends and followers into groups you can better manage your ever-expanding Twitter network.