I just received this notice today and am passing it on to you.
I went to TransportationCamp East in NYC in March 2011.
It was an unconference. See a StreetFilms.org clip: http://www.streetfilms.org/transportation-meets-technology-in-new-york/
Details for the 2012 TransportationCamp will follow later. Registration is free.
It is extremely worthwhile for mobility entrepreneurs to go. You need camp!