SMS Blast

I am wondering if anyone out there has used SMS (cell phone text messaging) to do blast outreach. Did it work? What did you learn from the experience? Is it worth encouraging other organizers to consider the option? What did you use? UPOC? txtmob?

If you haven't used text messaging but are thinking about it, I'd also like to hear from you. I think this could be a valuable tool but I am trying to listen to that little voice in me that keeps saying "of course you like it. you like computers. no on else likes it and there is a reason for that."

thanks,
Amanda