Leveraging Twitter

We have been experimenting with Twitter and using it as a way to get information out quickly and using Expert Voices to link to a given tweet to provide more information and context.  

We've also been using bit.ly  http://bit.ly as a way of tracking tweets and getting stats around postings.

I'd like to hear from others on how they are using Twitter and if you are using any widgets or applications that have been built around Twitter for tracking or pushing content.