I always point people to the article '1,000 True Fans' by Kevin Kelly. If you choose your thousand ideal customers or readers properly and find the single author blog that targets that audience, you never have to do any more marketing. You're done. That is a lesson that very few product developers and marketers have learned, and it's unfortunate.
Tim FerrissLanguage learning deserves special mention. It is, bar none, the best thing you can do to hone clear thinking.
Tim FerrissShort, sweet, and to the point. Clear writing, and therefore clear commands, comes from clear thinking. Think simple.
Tim Ferriss