In SF, breathing in technology
I've been in California for 10 days now, meeting with smart people working on interesting projects, and catching up on everything I've missed by virtue of the fact that I live in NY. Manhattan is fabulous for many things, but leading-edge web technology is not one of them. I really have to fight to stay ahead of the curve there. But in San Francisco, you breathe in technology like air.
Of course, this might be reflective of my own social circles... and not the cities themselves ... But I don't think so.