Hi,
For those of us not covered by your fine selection of maps, is there any way you could add the Openstreetmap.org tiles to the list? Sure, they may not always be complete, but hey, a little bit of something may often be better than only the LandSat 0.0625 tiles.
Besides, this could also potentially help with additions and editing of OSM which would then be available to make Topofusion shine even more.
You might try the
Openstreetmap.org site for info or possibly
Cloudmade.com since they also provide API tools for OSM.
Opencyclemap.org tiles would also be great especially since they contain Topo data.
Thanks for your product and continued enhancements to it.
Robert