I came across a website chock-full of really great information concerning Frank Lloyd Wright architecture and even more specifically, important architecture in Oak Park, IL.
The site is called Oak Park Architecture Database (a subset of dgunning.org) and it's a architecture-lover's dream come true! The database allows you to search for specific architects, addresses or original owners in the OP. As stated on the site:
This database is an attempt to compile many sources of information into one place; to give as complete a listing as is possible of the hundreds of architecturally significant houses in Oak Park. Little that is here is my own research, almost all of it is derived from sources which are listed on the detail pages for each house. I am grateful to the authors of each of these reference materials for their work. I am also attempting to get pictures for each of the houses in the database; this effort is ongoing, and many pictures remain to be taken.
It's a great example of the power of the Internet as a learning and research tool for passionate people.
The main website, dgunning.org, is also a wonderfully deep collection of Wright-related building photos and vividly detailed information. Check out both sites and prepare to spend some time exploring the wealth of architectural info they offer.
Both images copyright dgunning.org