You can now add a third important growth industry whose roots are there: Foo Camp, a new breed of geek gathering organized (somewhat) by O'Reilly & Associates, a thriving technology publishing business.#break#Foo Camp, held in early October, was extraordinary for many reasons, but perhaps mostly for its structure -- or lack thereof.#break#im O'Reilly, Foo's founder, made sure that basics like food, showers, and meeting space were available, but then quickly turned over the weekend's agenda to the geeks (literally -- there was no agenda until Friday night, when the attendees made one up on the fly). #break#Get 200 or so smart folks with a lot in common together in one place at one time, let them pitch tents, toss in a Wi-Fi network, and see what happens. Turns out, quite a lot. #break#At Foo, I was about as likely to bump into a founder of Google as I was a vice chairman of Warburg Pincus (both were there). #break#Tim Bray, a co-inventor of XML, huddled with Yahoo engineer Jeremy Zawodn