I wanted to get the most out of these maps as possible. The only thing that I would really like to see is some type of topo to the Google maps as well. So I overlayed a topo map on top of the Google map in the first of many experiments, until I get it right and the way I want it. If you would be interested in helping me with my ideas that would be great as well.

The 3DSolar addon includes current topo maps for the US.

http://bbs.keyhole.com/ubb/showflat.php?...&PHPSESSID=

Also, I've been working on a project for about 6 months now that adds historical topos into GE. More info on my work here

http://bbs.keyhole.com/ubb/showflat.php?...&PHPSESSID=

or here

http://www.fox-fam.com/gefiles/website/

Matt