I just finished renovating a Scottsdale mid century modern condo which I use as a vacation home (I live in Portland which is great but rainy). I've enjoyed driving around to a lot of the neighborhoods in Phoenix-Scottsdale that are listed on this site.
One thing that has been interesting to me is comparing mid century modern architecture in the area to that in Palm Springs. There are similarities of course but also significant differences. Here's a few off the top of my head (which mostly apply to homes):
Lots and lots of bright white exteriors
Edgier roof angles--butterfly, shed, a-frame
Oriented to outdoor living in a very strong way
Highly stylized (some would say artificial looking) landscaping
Muted exteriors--sandblasted block or desert colors, rarely bright white
Modern designs based on ranch house precedents with rustic design elements--block, rusted steel
Less oriented to outdoor living (remodels often address this)
Understated, natural landscaping
What are some differences you recognize? I find the approach in Phoenix to be perhaps more eclectic and interesting...