I have to admit I'm kinda afraid of Twitter...go figure! I'm certainly not a techno-phobe, but it IS true that I really hate to talk on the phone, and consider cell phones to be not for chatter but only for convenience and/or emergencies.
So, to answer your question, I think I'll skip the Twitter phenomenon, unless.....unless it really proves itself as a useful tool for promoting my business. And that remains to be seen.
The jury's still out on this one, for me at least.