Are trail maps available online?

Selling our printed maps is one of our primary means of supporting the work we do on trails. We are looking at various mechanisms of making maps or parts of maps available on the web. There are some brochure level maps that are missing some of the details available in small formats that can be printed on letter size paper. The full maps are very large files and need very large printers to print at a useful size. If they are shrunk to letter size they are essentially unreadable.

We have played with using Google Earth for presenting trail maps. Click here for some samples.