A couple of days ago, we showed youwith TweepsMap. There's another service that not only maps your Twitter followers, but also analyzes their gender, profession, interests, and more.
The beta service, by Schmap, is called Know Your Twitter Followers. To get your free (when you send a tweet) summary analysis of your followers, go to the schmap.it Know Your Twitter Followers site and click on the "Tweet + Free Analysis" button.
After you authorize schmap.it to use your Twitter account, you'll be presented with a summary analysis with the top-six results in six categories.
For a more-detailed report, you can purchase the full analysis that provides the top-100 results in 15 categories. The data is available as a downloadable CSV file as well.