UK Bus Texting
"...mobile phone users can send a text message containing a six-digit code unique to their bus stop to a local bus company.
Within 30 seconds a text message is sent back giving the location of the bus."
This is pretty interesting as the issue of finding oneself can be pretty daunting as Chris Heathcote explained in his ETech presentation earlier this year entitled "35 Ways To Find Your Location", which touched on using bus and taxi stops as a way to help find your location since they often use similar unique identifiers. In any case I'm still bothering my phone company to stop archiving my text messages for johnny law, and start allowing their customers to figure out where they are since they already know anyways.