Robert Lipe of the Middle Tennessee Geocachers Club gives the short answer about his nifty GPS case:

http://www.mtgc.org/robertlipe/GPS_Cases/

The best GPS cases I've found so far (Thanks to RL):

http://www.cartom.virtual-space.com/gps.htm
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Give a man a fish and he's fed for a day, teach him the internet and he won't bother you for weeks.