(I’m going to try calling these link roundups “Triangulations” and see how that goes.)

• Via GPS Tracklog, the difference between Garmin’s and Magellan’s topo maps.
• The National Geographic Society is planning a “mega-map” of the Sonoran Desert region. “It will zero in on 200 to 300 special sites nominated by the public — each site remarkable for its scenery, history, culture, art or cuisine.” Via GeoCarta.
• A map showing future extinction hotspots for mammalian species has been published; it maps potential, future risk, not a current crisis. See BBC News, Boing Boing and Nature coverage.
• Following up on a tutorial on how to create a Virtual Earth Dashboard widget for OS X, here’s round two: Extending the Dashboard Virtual Earth Widget.