The bay is where it's at for the kind of thing I want to do. The amount and seniority of people I spoke to face-to-face in 2 months in SF I didn't speak to in 3 years in London. San Francisco is a city so dense with developers and startup folk that New Relic feels comfortable paying for poster ads on the street. Being where the density of talent is, is a no-brainer. Besides that, the money is there, the partners are there, and the developer thought leaders are mostly there. It's kind of hard to make a case for being anywhere else, really. Plus, it's a pretty awesome area to live in, on the balance.