TweetThisText – Tweet chunks of text. Highlight what you want to tweet and use the bookmarklet to create a link to your quote. Also allows users to view the original source.

act.ly
July 28, 2009act.ly – Sign in to Twitter (OAuth, yay!) and petition @user to do something. Nice stats on who has signed up and petitionee (this is actually a word) responses.

twitcam
July 28, 2009twitcam – connects up with your webcam so you can stream live to Twitter. NB: Requires you to login in with your Twitter username and password. I haven’t tried this.

Twitteron
July 28, 2009Twitteron – Adobe AIR Twitter client (Windows, Mac, Linux). Features include changeable skins. Ooh.

TwitChuck
July 18, 2009TwitChuck – Greasemonkey script for reporting spammers from their profile page on Twitter.com or from search results on Search Twitter.

TrueTwit
July 18, 2009TrueTwit – validate your followers. You sign up and any new followers have to complete a CAPTCHA. Not tried this myself. If you have, please leave a comment.

tweeps.info
July 18, 2009tweeps.info – twitter user stats, “What do they tweet about? How much do they tweet? How social are they? Do they use hashtags? Share URLs?”

twittergrid
July 16, 2009twittergrid – see who is following who. Enter a username to display the avartars of that person’s followers, hover over to see biog. info and latest tweet. Pretty, but I tried it for @infobunny (that’s me) and it only showed some followers, not all.

Overlapr
July 15, 2009Overlapr - enter 2 Twitter usernames to find out what they have in common in terms of friends and followers.

TwitPrint
July 15, 2009TwitPrint - print your tweets. Not sure why and I’ve not tried this. It requires your username and password btw. If you’ve used this please leave some feedback.

Flickr my background
July 13, 2009Flickr my background – syncs your Twitter background with your latest Flickr uploads.

TidyTweet
July 13, 2009TidyTweet – filter your Twitter stream. Allows for:
- Automatic or Manual Approval of Tweets
- Custom Bad Word Filtering
- Whitelist or Blacklist Twitter Users
- Auto-rejection of Tweets from New Accounts
- Auto-rejection of Tweets with Multiple Trending Topics
Some of this seems a little sad, like “auto-rejection of tweets from new accounts” :( Currently free, but they say they are looking into pricing models.
