Not just pigs.  There's a farm right here the People's Republic of
California doing the same thing:

http://www.strausfamilycreamery.com/?id=44

Cheers,

Jeff

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com]On Behalf
Of Pensioner
Sent: Thursday, March 06, 2008 9:56 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Water Powered Cars

There is a pigfarm, here in the land of the free, that uses its lagoon of
pig manure to produce power to run part of it's operation.  Probing,
in-depth, investigation of the details are left as an exercise for the
curious reader.