Boulder Modern House:
Mid-century architecture in Boulder County, Colorado

Past Masters - European and American
 
Rudolf Schindler
Ludwig Mies
Erich Mendelsohn
Richard Neutra
Joseph Eichler
Frank L. Wright
Cliff May Registry
Local Historic Preservation, Architecture in General, etc:
 
Historic Boulder
Historic Denver
Space Age City:  Googie architecture, the Jetsons, Tiki and more
"Mid-Century Modern" at Wikipedia
 
Some Real Estate Sites, from California to London:

Denver: Todd Carpenter's site:
DenMod
Denver: 
Mile Hi Modern
Kansas City: KCModern 
Chicago, Joe Kunkel and
Jetsetmodern
London: 
The Modern House
Long Beach:  Another Cliff May site: Rancho Style 
Some books I've liked:
 
Alexander, Christopher, Sara Ishikawa, Murray Silverstein, et al. A Pattern Language: Towns, Buildings, Construction. New York: Oxford University Press, 1977. Lots of big and little ideas on shaping space. 1170 pages, but you can read a couple of pages at a time at your leisure. Why not just go to his website as well, right here?

Arnheim, Rudolf. The Dynamics of Architectural Form. Berkeley: University of California Press, 1977. Arnheim was Professor of the Psychology of Art at Harvard. This is very basic, conceptual stuff, combined with good examples.

_____________. The Power of the Center: A Study of Composition in the Visual Arts. Berkeley: University of California Press, 1982 (but he later did a New Version that he recommended). Indispensable for looking at art, and I started with this before I knew about Dynamics, and I think there are some good applications to architecture here as well.

Paglia, Michael, and Diane Wray Tomasso. The Mid-Century Modern House in Denver. Denver: Historic Denver, Inc., 2007. Over 100 houses are illustrated, with historic overview, map and index of neighborhoods.

Susanka, Sarah. Home by Design: Transforming your House into Home. Newtown, CT: Taunton Press, 2004. A follow-on to The Not So Big House, which you should get as well.

More to follow, as I think of them.
Links/Bibliography