Permission Marketing - do I dare?

Today I received Permission Marketing a book written by Seth Godin in 1997, edited in 2006 he tells me that what he wrote at the dawn of the internet, still held true in 2006. I'm intrigued to find out how he suggests "to build a permission asset instead of yelling at strangers all the time."
I read few other books of Seth Godin, any suggestions about similar authors?

ML