Some people will get it, others will not, in either case it might be a conversation starter, especially if are getting twitter updates via text message.
One additional feature I would like is the addition of a twitter short code, or ability to add your own username to the shirt, rather like the Reactee idea I wrote about a while ago. How much cooler than exchanging phone numbers than “adding” each other to your respective twitter feeds.
you want to follow me? I’m on twitter here