I've starting using twitter for business but so far I'm not sold. I see it as a way to be seen, but even then I'm one of what - 10 million people tweeting? So you really need to be directing people to your tweets. And to make sure that your tweets are of interest to people and also provide a way to generate traffic or sales for you.
For anyone who's found Twitter to be a good tool, would you mind describing how you are using it?
Since we're talking Twitter...Here's my twitter page with random thoughts on performance, health and nutrition here: http://twitter.com/OttawaAthlete