fun

Twitgap.com monitors the twitter-ers and aggregates the most popular tweets. Twitgap.com is also an index which categorizes and tags twitter users according to their profession and interests. It extracts most trending keywords, top tweets and twitter users on hourly, daily, weekly and monthly basis.

Express yourself easily and notify your twitter friends instantly! DrawTweet allows you to share your creations quickly with a slick and simple UI that is aimed at making drawing a social experience.

Peephole shows you all the latest photos that have been posted to Twitter. It is a great way to see what is going on in the world or just nearby.

Peephole is an alternate view of Twitter that shows the photos first. You don't even need a Twitter account, just a desire to see what's going on.

NOTICE: Twitter account NOT required

The nerdiest tweep is a simple Twitter application that analyzed your tweets to see how much of a nerd you are. 100 being highest and 0 is the lowest.

At TheTwittermaniacs you can find several cool and fun Twitter tools

GeoChirp helps you search for people Twittering for specific things in a specific area.

What is Twit4trivia?

Do you enjoy twitter? Were you always the first one to raise your hand in class when the teacher asked a question? Well why don't you try your luck with the new trivia on Twitter.

Twittospheric let you see in real-time all tweets about any topic like if you were in the twittosphere!
It's a fun & cool way also to explain to your friends what is Twitter ;) with an original visualisation of the new tweets, there, up in the higher skies!

You can follow the public timeline: http://twittospheric.com
or follow one user: http://twittospheric.com/oprah

An app that allows you to use Twitter easily from the iPhone.

Allows you to use Twitter whilst you are using Yahoo Instant Messenger.