Twitter tools
Tweetdeck
Personally, I think this is the best Twitter client/interface I've used so far - they also have a version available for the iPhone.
TweetStats
Find out more about your Tweeting-patterns:
Twitalyzer
Find out about your Twitter 'influence', 'signal', 'generosity', 'velocity' and 'clout':
TweetPsych
This is interesting - build a psychological profile of a person based on the content of their tweets:
Twitter Karma
Find out who isn't following you back and who you're not following:
BackTweets
Lets you search for links on twitter (even through URL shorteners). Useful if you want to see who's been tweeting about your website. They also have a WordPress plugin for it.
Twuffer
Twuffer is a "Twitter Buffer" that allows you to schedule tweets for a later time
Qwitter
Qwitter lets you know when someone has stopped following you
Did I miss something? Let me know in the comments. You can also follow me on twitter
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