another useful link...
check out ramblings of yours truly at www.energyefficientarchitecture.com.au
Densification of inner urban areas.
This post is specific to Melbourne Australia, but seems to be a common condition of western cities around the world.
Some would say that this is a no brainer. Unfortunately, not all see it that way. Where there is opportunity to build high, we should. For years various bodies have been campaigning for the increase of housing density along urban corridors defined by tram lines, infrastructure such as shopping strips, and ideally within walking distance of everything one needs to live.