Monitter: A Keyword Tracking on Twitter ( i love this one, worth to try )
#Hashtags - Realtime Tracking of Twitter
CityTweets - The CityTweets Network is made up of individual pages that track (near) real-time Twitter activity for individual cities, listing Tweets from and about that area.
Cursebird - Cursebird is a real-time feed of people cursing on Twitter
DoesFollow - Find out who follows whom on Twitter
FriendOrFollow - Submit your Twitter screen name to find out who you’re following that’s not following you back, and who’s following you that you’re not following back.
Happy Tweets - A measuring stick for how positive, or happy, a particular Tweep is.
Qwitter - Qwitter e-mails you when someone stops following you on Twitter.
TweetBurner - Shorten and track the links your share on Twitter and Friendfeed
Tweetmeme - Tweetmeme looks for new content and tracks who else is talking about it.
TweetWheel - Find out which of your Twitter friends know each other!
Twitt(url)y - Twitt(url)y is a service for tracking what URLs people are talking about as they talk about them on Twitter.
TwitterCounter - Add a daily updating TwitterCounter to your blog so everybody can see how popular you are.
Twittermeter - Twitter meter let’s you query an index of all the words that have been sent to twitter
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