I have created a small VB program interfacing with the Twitter webservice (API) and retrieving XML's files etc.
http://apiwiki.twitter.com/REST+API+Documentation
My Home Automation (Domotica) system can now send messages for all kind of events to Twitter.
For example if somebody call my frontdoor a Twitter message is send with a URL to the picture my system has taken of that person.
This is my Twitter Url http://twitter.com/bwired
Check out my Dutch weblog for more info http://www.bwired.nl/weblog.asp?id=251

<b>What is twitter?</b>
Twitter is a service for friends, family, and coworkers to communicate and stay
connected through the exchange of quick, frequent answers to one simple question: What are you doing?
<b>How do I use it?</b>
Tell us what you're doing in 140 characters or less!
Send your thoughts, observations, and goings-on in your day.
Whether you're "eating an apple" or "looking foward to the weekend" or "Heading out of town" it's twitter-worthy. Join us here.
<b>Do I need anything special to use Twitter? </b>
In order to use Twitter you will need one of these things: an internet connection or a mobile phone.