I find that here in Oregon, an umbrella with a ponch is the best form of "breatable" rain protection. I love my Golite umbrella:

http://www.backcountrygear.com/catalog/accessdetail.cfm/GO9010

BF <img src="/forums/images/graemlins/cool.gif" alt="" />
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Hammockers aren't stuck up, they're just above it all.