Find out Who Follows You and Who Doesn't

This tool basically shows 2 lists:

1) A list of your Twitter Fans: people who follow you, but you do not follow back.
2) A list of tweeters who You are a fan of or that don't follow you back.
Works for the first 2000 contacts

Twitter Fan - by @badijones is a tool built - made with code from David Billingham's Twitter Class using Twitter API - Download the source here