Why Twitter?

I'm not a technophobe. I don't blog as often as I mean to, but when I do, I enjoy it. I use IM on a regular basis. So, why do I have no interest in using Twitter? What do others see in it that I don't? Anybody out there reading this who can explain it to me?

Update: I have similar feelings about Google Buzz – I believe I have a good understanding of how it works, but I don't understand its value.