The Science of Bicycle Seats
Jim explains this well from a bicyclist's and historian's perspective. Burried in it is a lot of info you can use and adapt to your riding style. a good quality mountain bike saddle works for me and wall mart does not carry a good one. When I raced and rode 500-1000 miles a month a narrow racing saddle was prefered by my butt. I just went along for the ride.

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LennyHarp of Lenny's Bikes & Things
http://lennyh.com
The true value of a man is not judged by what he has, but rather by what he can do without.
"We are what we repeatedly do. Excellence, then, is not an action, but a habit." -- Aristotle