Visit the site here, add yourself here

it’s best to register with them so that you can update your profile as well as create an extended biography

They have a large variety of categories

Loaded Web

Visit the site here, add yourself here. This is a location based directory. You can currently see users in the USA, Canada, United Kingdom, Australia, and New Zealand.

Just Tweet It

Visit the site here, add yourself here. Another directory with a large range of categories to add yourself to

TweetFind

not only allows you to view Twitter users by category but also by rank.

Visit the site here, add yourself here

You can also view and keep up with Twitter trends

Mr. Tweet

Mr. Tweets looks through your current Twitter relationships to suggest compatible followers. It also will suggest you to other Mr. Tweet users who are similar.

Visit the site here, add yourself here

TwitR – Very similar to WeFollow. Add yourself here. Tweeple Pages – Organized by interests. Add yourself here. My Twitter Directory – The Twitter yellow pages. Add yourself here. NearYoo – Adds Twitter users to a map. Follow @nearyoo to try it out.