I think these are two of the most sustainable and cleanest energy sources. I have fantasies of a future where these play a much more major role in how we power the world than they do currently. Surprisingly, a quick search of Cyburbia doesn't turn up much discussion of them. So let's start that here.
Solar comes in two forms: Solar power generation and "passive solar". I think passive solar is brilliant stuff and should interest planners because it is mostly about planning infrastructure to take advantage of seasonal variations. Most people would likely think of it in terms of "energy conservation" but I don't think that's completely accurate. In essence, it uses sunlight to help heat a home (or other building) in winter and shade to help keep it from getting heated up too much in summer. It tends to be very low tech. And my understanding is that it results in a building that is more fundamentally comfortable.
Wind power: Well, this is kind of a secondary source of solar power since the sun's energy is responsible for making wind to begin with. I thought about leaving it out of the title of the thread entirely because of that but I know most people don't think of wind power as a form of solar energy.
I also like the fact that solar and wind tend to complement each other: if it isn't a beautiful, sunny day, the odds are good that winds are higher than usual.
Here are a few (somewhat random) links:
Solar Energy: http://www.solarenergy.org/
Wind Power: http://www.awea.org/
Here is a page I really like, a map that shows state resources: http://www.eere.energy.gov/windandhy...activities.asp
Map that shows how many megawatts of wind energy are produced in each state: http://www.eere.energy.gov/windandhy...d_capacity.asp
Last, I will note that I also like solar and wind for the potential to support my other dream of having more distributed, small/local generation instead of relying almost exclusively on centralized power generation.