For many, it's probably ridiculous of me to think that you've never heard of Seth Godin before, but if you haven't, take a moment to learn more. Trust me, it'll be worth it. Although he might seem to be a "marketing guru" or a "business consultant", Seth is really so much more.
The reason I felt the need to post this was a recent interview I heard with Seth on Bullseye with Jesse Thorn. It encapsulated everything about Seth (from my perspective) in one place, which isn't easy to do. I'd suggest listening to the interview (Soundcloud player below - skip to 42:00) as the best way to get acquainted with Seth and what he is all about. From there, check out his blog and perhaps some of his books.