Take the WSER Flyover Tour:

A vivid, animated 3-D overview of the terrain covered by the annual Run.

If you don’t already have Google Earth loaded, download a copy here (It’s free.)

You need to have a broadband internet connection and a relatively up-to-date system to run Google Earth. Details on the Google download page. If you have Google Earth loaded on your computer…

• Download and launch the WS Flyover File. (671Kb)
• A tour file called WSERcourse2010.kmz will be
  added to your “Temporary Places” list.
• Select the tour and click the Play Tour icon at the
  foot of the Places list. (See sample above.)
• The display will zoom in on the 100-mile WS100 Race
  course, and then “fly” to each of the main Aid Stations in turn, starting
  at Squaw Valley.
• Sit back and enjoy the ride! Or, you can pause the
  tour and use the on-screen controls to explore the terrain on your own.

Special Thanks to Western States finisher Nick Ham of the UK for
contributing this tour.