Up-to-date projects are listed in the [SAT] Metalab secret blog here
A location-based audio-tagging and remixing environment demonstrated at the ICMC 2009 in Montreal. Set in an outdoor audio augmented environment, several mobile users may create and explore a gradually evolving wall of audio graffiti. Equipped with headsets and small mobile computers, each participant can tag or spray the wall with their audio, mixing in with pre-existing musical material.
In International Computer Music Conference (ICMC), Montreal, August. 4 pages
Audio Graffiti: A location based audio-tagging and remixing environment Bibtex