Seth Godin's Blog
Godin is the author of nearly a dozen business books and a popular speaker at conferences. Reading his blog, it's easy to see why people pay to hear what he has to say. Godin is a marketer, but in the broadest sense of the word. He's interested in not simply how products are marketed, but also how people sell themselves and their ideas, and how new technology can be a game-changer. His blog is full of insights about the social changes wrought by technology and the nature of creativity, and it offers loads of practical advice. There are tips on how to plan for a deadline so it doesn't destroy you, how to market yourself for your next jo, and the importance of asking at least three stupid questions a week. Godin's musings provide daily fodder for countless other bloggers ("Seth Godin has an interesting post today..."), so you might as well go to the source.
Sample Seth Godin's blog post: Creativity changes the game, whatever game is being played. 'We're going to run out of cash by the end of the year,' is accurate unless you count creativity into the equation. Then the accurate statement is, 'Under the current rules and assumptions, we're going to run out of cash...' Big difference.
Entry you'll never see: Is marketing evil? Based on a long career in the business, I'd have to answer "yes."