Foul Locales: Urban Blight is a seriously ambitious book. Some of the locations are many pages long and absolutely filled with stuff. Keeping in mind that there are 18 locales in this 128 page book that is around an average of 7 pages for each location (of course, some are larger than others and two of them are mini-locales).
I think what you all will find most enjoyable with these locales is the fact that most of them are made to be an-ongoing part of your game and should last you a long, long time.
The players might frequent the "gambling house" locale or the Library for a year or more of game time and still not uncover all the plots and sub-plots going on in the establishment. Heck, the PCs might keep going there and never realize there is a sub-plot until the GM wants them too.
We have provided numerous background and plot ideas to these locales so that the majority are not used just once then tossed. They have very detailed characters with personal motives and goals. Add the plots to this and you have something that, we hope will last you a while.
Also, they are themed on the darker side but really should be able to fit into any standard fantasy d20 setting with little or no alterations (personal campaign stuff might bend them a bit).
We are already deep underway with Beyond the Walls now which are Rural locales like trading posts, a horse ranch, haunted locations on the road side, a detailed goblin locale and much more. It will use a similar, rural based coding system to Urban Blight so GMs can easily plop these locales into the appropriate place at need.
If you have questions about these books feel free to ask.