Public Information: Here is a place to start. Condensed information about each state:
Aerial Photos: Enter an address, and the "Terrafly system will put you at the controls of a bird's view aerial imagery to explore your digital earth." : http://www.terrafly.com/
Landkit: My old on-line country property planning tool. Some of these links may not be current. http://countryplans.com/landkit.htm
email me any great links to property research tools and I will add them to this list.