Is there much farming in your area? If there is, check with the FSA about where they post their yearly crop photos. These are pretty good. They are in color, I personally prefer IR. They are free though and you can georeference them if you have the capabilites.
Isnt it amazing what those satellites can pick up? I checked out our place and found out you could even see my cattle and stacked hay bales.
I think there is a site called www.zillow.com that most folks can go check out to see what value their real estate and homes are worth past, and current values. Photos are included. The people that live in residental areas have had photos taken of their homes. Check it out.
When I went to the local Conservation office with some questions they just pulled up some aerial photos of our farm and printed them off for me. The man said they had pics of the whole county and I assume it's that way statewide. Might check with your local office. They may have just what you need.
The really good pictures on Google Earth are taken from airplanes. Some areas have aerial maps and some don't. The state of Indiana paid to have aerial mapping done, so if you look at Indiana, you can see that my cows are Herefords, where if you cross the Ohio River, you are lucky to distinguish houses.