Found this site the other day, thought it might help some here. Are there other sites like this?
http://mapper.acme.com/Looks like they added the Terraserver Topos and B/W aerials (the same maps TopoFusion uses) to a google maps interface. Useful, for sure, but hard to get much GPS data in there.
http://gpsvisualizer.com is another site that gives a number of map options and also allows you to display a GPS file on top of it.
Of course I prefer being able to load multiple tracks, edit, merge, etc.