I hate to jump around but I found this article and its is part of the answer to the bread tabs. Bread tabs and tagging homeless people.
Christian Nold, artist, lecturer, designer, cultural activist ... etc, makes a lot of maps, collective maps. He has an on going map on RFIDs. The goal of the map is to provide an overview of the battle of language in the socio/techno/cultural space and to show the connections between language and actor networks.
In order to gather the data for the map, they are currently organizing participatory workshops as well as interviewing people with experience and ideas around RFID.