Ninja Monkey Party 411 : Instant Mobile Social Network Or; Listserv + Email-to-SMS Gateway = LOVE
Ninjamonkey describes a service he setup for his birthday party a couple of weeks ago using off the shelf components. Of course the magic sauce was that his crowd includes some tech savvy and highly motivated social drinkers.
From the page:
Social networks and mobile applications are obvious bedfellows, but aside from a few noteables like dodgeball almost nothing has been done to exploit them. The thing that many people may be missing is that SMS is pretty much like email, except with extreme size restrictions (160 characters/message) and controlled solely by the telcos (which is sort of like having a draconian ISP with terrible, terrible service). This means that as long as you can find a way to translate between email and sms (with, say, a publicly available email-to-sms gateway) you can pass messages between them.