The Maturango Museum in Ridgecrest, California
This site contains lots of information about current conditions in Death Valley.
Delorme Atlas and Gazetteer
This site shows information about topo map books for many states in the US.
Yosemite National Park News, Weather and Traffic Information
Current information about Yosemite National Park can be found here.
California Snowpack Information
This site allows access to data from various weather stations across the state. It's a useful way to monitor the daily temperature and the depth of the snowpack at various places.