Are there any sites that come to mind that are using Python in the valley? I would love to check them out!
I am from New York and I really don't hear people talk about Python much. For the short amount of time I've been using Python it has made me want to ditch PHP.
There's builtwith.com - looks at server response headers etc. Doesn't always detect everything because hiding such information is a security advantage for website owners.
Hopefully not. For the most part, that list was compiled from either personal experience or networking (E.g., sitting in on a "how we use Python at Quora" discussion at Pycon, for example). Unless one specifically crafts their HTML to say "Powered by Python" or "Powered by Rails" (sometimes people do, but even those aren't necessarily trustworthy), neither Rails nor Django projects are likely to contain any artifacts that would indicate what they were built with.
