My EDC is centered around the urban environment <img src="/images/graemlins/smile.gif" alt="" /> I just don't talk about it a whole lot. My PSK, on the other hand, is centered around the wild and that seems to get more attention

As far as urban survival, the best people to talk to are the people who do it every day-
http://www.donrearic.com/homeless.htm

That's more long term, obviously, and luckily most of us will never have to be put into a position like that- we'll have friends around the city, or someone we can call. Course, getting stranded in an unfamiliar city... that could get complicated!