Twitter is my all time favourite microblogging as well as social networking platform. If I found some interesting Twitter tool or application I usually
Add your Twitter backlog feed to your favorite calendar application and browse through your personal Twitter diary, making your Twitter history both fun and useful!
This is a hideous tool that can be used to export your entire Twitter timeline to a CSV file, readable by any spreadsheet application (Excel, Numbers, etc.). Exported data includes the tweet plus a timestamp of when it was sent.
S.Vesper's wiki page about Twitter: an explanation, Commoncraft video and the free software applications that will automatically update as you get new 'Tweets' so that you don't have to go to the Twitter website
Article by Vicky Hennigan - an up and comer in the parent edublogger category about the use of twitter for missing children alerts. Don't know a lot about how this would work but think that perhaps there are applications for having public twitterboards for such things.
We have released "Auto Tweet" feature in our Twitter Application.
You can use it here http://qualitypointtech.net/twitter_Application/twit-status/connect.php (You need to login with QualityPoint Account for using this Link)