Jason Fried, Founder of 37 Signals, talks about why teaching is such an important aspect of marketing. Must watch for anybody who's trying to market and sell a product or service (or sell anything, for that matter).
The Talk: Marketing by Sharing Jason Fried is the co-founder and President of 37signals, a privately-held Chicago-based company committed to building the best web-based tools possible with the least number of features necessary. 37signals' products include Basecamp, Highrise, Backpack, Campfire, Ta-da List, and Writeboard. 37signals also developed and open-sourced the Ruby on Rails programming framework.