Cycles for external (architectural) rendering

Hi, I’d like to use Cycle for external rendering (I’ve to produce a city scene with a road and buildings along it). Is there any reference scene to be used to study and learn? Or, is there a good tut to learn from?

Thx

I enjoy BlenderPedia’s tuts on Architecture.
Here is one on YouTube here:

If you want to model a city, try this:

http://www.blenderguru.com/videos/how-to-create-a-city/