The Celestron SkyScout (Flash page) is an amazingly cool portable device combining an celestial object database with GPS abilities. It's not quite the Hitchhikers Guide to the Galaxy, but it's definitely one of the most compelling applications I've yet to see of GPS - it takes note of your viewing location, and uses text and audio to guide you around the night sky. Announced at the CES show, there's no pricing info yet.
http://www.celestron.com/skyscout/no_flash.php?Flash=N
Topic: The Celestron SkyScout (Read 1034 times)