Two Google Earth tools, courtesy of the mysterious Meils:
“1. Smooth Path takes the path you give him to chew on, performs a cubic interpolation between the successive points in it and spits out a fresh kml-file with the result.”
“2. Random Path extracts the coordinates from your placemark and generates a random path around it.”
The first one is great for avoiding those rather abrupt changes in course when flying above a typical turn in a path. This makes it much more like flying. The second one is akin to, erm, flying suicidally?