Pretty cool!
I've been considering creating something similar to offer our clients and I'll probably add this script to our resources area. Twitter is a growing community and can prove a great marketing tool - especially given that Twitter openly allow people to use it for commercial purposes.
I actually had a chat with our web developer about using twitter for marketing a radio station a month or so back for Talkwebcasting;
http://www.youtube.com/watch?v=FTWxnMGx3zA
By the way, any twitter people who'd like to follow us, feel free!
http://twitter.com/wavestreaming 