Sounds interesting - like a good "play" project for a slow day here at the office (and, as you might expect, slow days don't happen too often). Google Earth does kick much booty, though, so maybe I'll see what I can do <img src="/forums/images/graemlins/smile.gif" alt="" />

If you have an example apps you've seen that do something similar, it'd be interesting to see them.

- Pete