I mentioned these books below, but they serve as a reasonably comprehensive answer to this question: * http://www.amazon.com/Walkable-City-Downtown-Save-Americ

I mentioned these books below, but they serve as a reasonably comprehensive answer to this question: * http://www.amazon.com/Walkable-City-Downtown-Save-America/dp/0865477728/ http://www.amazon.com/Walkable-City-Downtown-Save-America/dp... (Warning: Speck's tone is pretty bad.) * http://www.amazon.com/Happy-City-Transforming-Through-Design/dp/0374168237/ http://www.amazon.com/Happy-City-Transforming-Through-Design...