Kinda a "dead thread" and I haven't done anything recently; but you might want to check out this thread. I'm just not good at organizing and networking people...
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1276902506
Personally, I want something that is inclusive and centralized for the metro Phoenix area; right now, there's HeatSync Labs, a hackerspace in the Mesa/Tempe region - a little too far east to get to on their meetings for me...