There's a great presentation on how we should be thinking about future energy supply in urban and transport planning called "Ten Principles of Post Oil-Peak Planning" (this link downloads a pdf file of the presentation). It's by Tim Moerman from the Greater Moncton Planning District Commission (Canada). I saw it on Planetizen, an extremely useful website for planners.
One of the things I appreciated about Moerman's presentation is that while the conclusions are very serious, the presentation is well reasoned and not a tirade. The main message is that an oil shortage is coming (we'll either gradually run out of oil or there will be a sudden disruption caused by, for example, war), there are not many good alternatives for oil, and that we should be planning for our future lack of oil right now.
It's really a fine presentation.