Do you twitter?

I'm a little amused, I've been twittering for about seven months or so, and I'm shocked at how often people decide to follow me. I have a little following of about 40 people and recently I've had a number of people decide to follow me.

I'm most surprised because, as you can see in my sidebar (where my twitter widget is), I don't write about much worthwhile.

I'm just curious. Do you twitter? What's your username and why do you do it? Also what kinds of things do you post, and are they worthwhile?