I may be able to answer my own question...as I read around on the site, they reference "hundreds of trails." So I'll curb my enthusiasm. Still, with user-submitted trails perhaps this will turn into the uber-site some of us have hoped for.
Let us now invoke incantations for the great GPSBabel to spread the wealth to devices beyond the GPS-enabled phone caste.
This will open Trimble up to a LOT more people. While this could obviously result in a lot of lame submissions, I think that for the most part this can't but help. I'm stoked, personally.