I was almost ready to tell you about Doug Cox's USA Photo Maps, a pretty cool mapping program that marries your GPS with Terr's aerial maps and USGS' topographic maps.
But I found something cooler (but not as mobile).
Google's Earth (a free download) lets us visually step through a trip on an unknown route. I can take a virtual flying tour of several locations, some preprogrammed into the stand-alone application.
High cool factor!
Google Earth - Home
