TwitterSheep profiles your followers in a colorful tag cloud.

BubbleTweet let’s you add video to your Twitter page in seconds.

twitsay: Give your Twitter Account a Voice! Record up to 10 Seconds using your mobile phone.

Twittercal is a free service that connects your twitter account to your Google calendar, add events in a snap from your favorite Twitter client.

Search Twitter in realtime – see what the world is doing right now.

Twitterfall is a way of viewing the latest ‘tweets’ of upcoming trends and custom searches on the micro-blogging site Twitter. Updates fall from the top of the page in near-real time.

TweetGrid is a powerful Twitter Search Dashboard that allows you to search for up to 9 different topics, events, conversations, hash tags, phrases, people, groups, etc in real-time. As new tweets are created, they are automatically updated in the grid. No need to refresh the page!

Your Twitter Ratio is the ratio of your followers to friends (or people who you follow). It is measured with the TFF Ratio (Twitter Follower-Friend Ratio). The higher the ratio, the more Twitter heat you pack.

Send messages to twitter using voice.

TwitterFone is free service that lets you update your Twitter feed using your voice from any mobile or cell phone. You call it, speak your tweet, and hang up. A short while later, your tweet will be posted on Twitter. Magic! (more…)

Twilert is a Twitter application that lets you receive regular email updates of tweets containing your brand, product, service, well any keyword you like really.