There's a lot of aerial imagery out there that's free for reuse. Instead of having to gather it from dozens or hundreds of agencies, I'm working on a project to do the same kind of thing that Google does: provide access to all the different imagery in one single interface.
I put together something to do this: you can see it starting to come together at OpenAerialMap, if you're interested.
- OpenAerialMap
testing this one...