Today Twitter passed from being a website that I use to a service that I can't imagine living without. I'm just noting it for the record, so I can look back on this point. If you feel like you'd be interested in multiple 140-character messages from me every day about the minutae of I'm up to, frequently totally out of context or directed in response to people you've never met, then feel free to add me. A look at my current stream does give a remarkably accurate picture of my day-to-day life in a way that this blog does only hazily.
Other than that, I'm not gonna do a hard sell; you'll either get it now, or you'll get it later, but eventually you're going to end up using it. Just like blogging (shut up, non-bloggers!).