Another way is to use a program like easy gps. That way you can edit your files to make them more meaningful, esp if you are consistant with your icons.
for instance, I have an easygps file called "huntclub" where all my waypoints and tracks from the huntclub are on there. That way I can use the same name for more than one locatation. I can only think of so many ways to say "bridge".
If I am going to the mountains to see my friend, I delete (or backup) all files on my oregon, then load the ones specific for that area.
I have not done this yet but I have noticed that the oregon saves all the waypoints you make in a day in one gpx file. This file can have many waypoints. So you can have many gpx files and many waypoints. Or you can backup your gps and save the file. then delete all waypoints and gpx files, then reload the single gpx file with all your waypoints.
I still have to find out if this is really important. It seems like something to do everynow and then to keep your files organized.