I joined the Twitter band-wagon more or less one month ago, and I'm using Twitteroo to receive my "friends" notifications on the desktop, so I think it will be a good idea to receive a notification every time a build is triggered on the Subtext build server.
I downloaded the publisher, installed it on Subtext build server, added 2 lines of configuration in the ccnet.config file and in 5 minutes I had the twitter publisher up and running.
After you change the config file remember to restart CC.NET to load the new build publishing task.
Here it is a new build notification on my Twitteroo client:
And on Subtext build twitter page you can see the list of all the builds, or add subtextbuild to the list of your Twitter "friends".