The current "This Old House" Magazine has a cover story of a restored mid-'50s Usonion in Ohio. The Penfield House http://www.penfieldhouse.com/
It was the ultimate DIY project for the owner. He even logged his own trees and made his own plywood to build furniture that Wright designed for the house, but was never build because of the budget woes when the home was constructed.
The great color photos show one of Wright's more lighter, cleaner Usonions. I sign of the times for Wright.