What do you mean with 'dispersed cities'?
Well, what I mean is the basic rules allow for fleshed-out cities filled with various locations, but also can be used, with some small modification and considerations on other scales and settings. What I have here is a "City" which includes one medium-sized city (for canada, about 350,000, i think), one smaller city, many smaller towns and several notable locales and areas in the region of South-Western Ontario. It's a HUGE document which has taken me months to write in it's current form, over 15,000 words. It's presented as the "Corey and McKenna Security and Investigations: London and Area Journal". It's been written by "the Muscle with brains" Steve McKenna and with some commentary by "The Talent with Trouble" Jon Corey. Evenually, as the other player has time to read the whole thing, he'll add more comentary and so it will be a collaborate effort produced by these two as a reference document detailing the area in which they work.
It's written in-character and so it bears the marks of people who are politically incorrect, inexperienced with the supernatural and quickly realizing they do not know nearly enough about the area they live in; thus the campaign aspect; Ignorance is Not Bliss. Much detail in some areas is lacking and some locations do not have full threats/themes/aspects/faces.
Mouse and SunlessNick, you sound like you have the right idea, that's pretty much what we were going for. As we're encouraged to use local areas we're familiar with, my group has run with this idea.
Are you sure you guy want me to post this? It is a weighty document and intended to be produced as an in-character work, much like the examples and indeed; the rulebooks themselves.