followers

At TheTwittermaniacs you can find several cool and fun Twitter tools

Twitter SPY displays the Twitter public timeline in a fancy and addictive way with Google Maps and some optional filters.

Groups twitter users and messages using hash tags. Twitter users can update their stream with a tweet containing up to three hashtags they want to be included in and WeFollow adds their messages into the proper categories. The user list in each category is organized by the number of followers they have. Excellent directory of twitter users.

Allows you to know if one person is following another on Twitter without messaging them.

A way of discovering new people on Twitter and increasing your followers. If you find someone you like, you can vote for him or her.

A Twitter application ad network which is a great way to get more followers and support your favorite Twitter apps. If you're a Twitter app developer, it's a simple way to start monetizing your application.

A fun application that returns a tag cloud of words from those in the profiles of your followers. This means that you can see what sort of people are following you.