I won’t claim to be an avid Twitter user but have found it very helpful in keeping a live pulse on what’s going on with certain topics or people I like to keep up with and connecting with service providers (e.g. web hosting company, cable company)
I’ve heard all the arguments from people not using Twitter because it forces you to think in 140 character limitations to people who refuse to use it because of some bizare NIH (Not Invented Here) syndrome. Here’s a funny video for those against Twitter.