This morning for the first time, Garmin would not allow me to send a google map to my Nuvi 500. Got the same 'plugin not unlocked' message. My search led me to this thread and then to this:
http://www.elsewhere.org/journal/gmaptogpx/
Probably old news to most folks but I'd never heard of it. Works like a champ! Easily takes any google map page (and probably any page with map data, not just google) and cranks out a gpx file. Thought it worth mentioning here. Thanks everyone!
StanO