I live in Chicago, and lately I've been doing a fair amount of ambience recording in the various neighborhoods and downtown. So many city ambiences on SFX CDs sound like Manhattan at rush hour to me, so I'm trying to capture some variety, and some subtle variations if I can. I already have a long list of locations I plan to record. And like many folks here, I have thoughts of selling the resulting sounds as a package.
To that end: when you pull up a city sound from a library, what are you hoping to find? What are you not finding? What do you wish was available? If you don't live in or near a big city yourself, do you get everything you need from what's already available? Does this sound like a good idea?