Here was my idea for a gmap layout.
Basically, everything would be equidistant from everything.
The hospital and unstick me would be in the center, and the only other possible no pk zones would be some businesses, which are still equidistant from gang bases etc.
These could also server as possible meeting spots before raids which would be great for stimulating the economy. I'm sure if a gang was meeting at the food business before their raid, a few people would spend their money on food.
All other businesses and buildings could be thrown into all of the empty spots, and it would be really easy to create a life-like grid system.
It may be a little to proportionate for some of you, but if you think about the benefits, it'd work out pretty nicely.
http://img523.imageshack.us/my.php?i...alayouttl7.png