If you love Twitter and you use Outlook (let's be honest, nobody loves Outlook), OutTwit has combined them into one tasty tool. OutTwit is an extension to Outlook that allows you to use Twitter from within Outlook. You can get update your status from within Outlook and keep track of your friends movements in Outlook. It has a lot of nice features too:

- The ability to automatically shorten URLs in your messages using tinyUrl so that you're messages take up less bandwidth

- Configurable time check interval

- Automatic categorization of new Twitter messages.

If you are already using both Twitter and Outlook, seriously consider checking out OutTwit