Quote Originally Posted by artsinaction View Post
Our household has three people, three copies of Aperture, one copy of Lightroom, two digital cameras, two photo-filled phones, four photo-filled iPads and three desktop computers with, yes, lots of photos.
So far you've described a pretty normal "technical" household. Some (like myself) have even more dispersion than you describe.

In any case, here's a solution, baked into an app you probably already have/use:

https://www.dropbox.com/help/289/en