Tagging of information and websites seems to have become all the rage online. Now foundcity takes it to the streets:

FoundCity is a collective mapping tool. It allows everyone in a city to map the interesting things they discover throughout the day to a dynamic online map, where they can then compare their points of interest with other people’s points. In doing so they both share what they like about the city with others, and discover what other people find fascinating about the city. It is an open-ended, continually evolving tour guide to the city.

Foundcity allows participants to tag various points of interest around the city with keywords by sending text messages from their cell phones. On the web side, foundcity extends Google Maps and gives the tags geographic context.