Open Cycle Map–Well developed in Europe. The local map is clogged with private driveways. Something to aspire to.
Caltrans California Road System Maps–These are intended to show the eligibility of roads for federal funding. Good if you want to see major routes. Interesting for map geeks and free.
See the Google Earth Map Overlays page for a variety of maps to use with Google Earth and the Tuolumne Bikes map.