Hi Tim. You are right; the advice on the ACA web site is mostly about getting data into the GPS receiver (GPSR), not getting it out.
Did you buy a set of maps to go with the 60Cx? You should, to get the most utility out of it on the road. Included with the maps is the MapSource program, with runs nicely on a netbook and provides a single place to do all the things you need:
* Edit the ACA routes to fit your own preferences,
* Build your own routes, mark new waypoints,
* Transfer these to the GPSR,
* Transfer daily tracks logs to the netbook, and
* Display them on the Garmin maps.
The MapSource user interface is clunky, but has all the necessary functions and works well once you get used to it.
The 60Cx does not transfer a file, but a serial data stream on the USB port to the computer. MapSource can write your track logs as GPX files, among others. GPX is widely accepted, and many web sites can read them and plot them on Google Maps. There probably are sites to transfer to Bing as well, but I have not used them.
What does the display look like? You see a road map, a toolbar, the ACA route if you have downloaded it, any track logs you have transferred, thousands of points of interest, and any waypoints you have loaded (e.g. campsites from ACA). An optional panel shows waypoints, routes, and track logs in tabular format.
If you have not bought maps for the GPSR, all the transfer functions are available with G7ToWin and numerous other free programs. They are harder to use, without the mapping functions.