Twellow is a large Twitter directory and have a wide range of categories to chose from, making it easier to target your niche followers and to be found a lot easier. Add yourself to Twellow here.

WeFollow is conveniently organised by tags, with each area showing the tops users for that category.  Add yourself to WeFollow here.

Tweetfind is a live twitter directory that allows you to rank and view Twitter users by category. You can add yourself to TweetFind here.

Loaded Web is a location based Twitter directory and allows you to see users from a number of countries including USA, Canada, United Kingdom, Australia, and New Zealand.

Just Tweet It is one of the larger sized Twitter Directories with a larger rang of categories to add yourself too.

Mt Tweet is a unique Twitter directory that does the directory adding for you. Add yourself to Mr. Tweet here.

More directories:

• http://geofollow.com/
• http://twitr.org/
• http://twitdir.com/
• http://mytwitterdirectory.com/