I was skeptical. But Twitter has been a quite interesting way to encounter other ideas, other people to have interesting discussions with, etc. Yeah, the short tweet length is limiting, but most of my recent articles started out as tweets to other people or was inspired by ideas I encountered there.
My suggestion: Once you sign up on their web interface (and click 'Follow' on me :-), download a Twitter client. Twitter clients add things like hash searches and easy threading of comments. I am using Nambu on the Mac, I have no idea what a good Windows or Linux client would be, but anything's better than Twitter's lame web page.
-- Badtux the Twit Penguin