Tara Hunt presented The Whuffie Factor and is selling the book in the WordCamp lobby. I would have bought a copy but it looks like it is cheaper on Amazon. She had a great presentation so check out her website / book.
“Embrace the chaos! The Whuffie Factor weaves stories from Moleskine, 37Signals, Threadless, Willitblend, and Gary Vaynerchuk into a compelling story of the way business is now done. Tara doesn’t just talk about it, of course, she does it herself.”
—Seth Godin, author of Meatball Sundae