Have you read Seth Godin's latest? As usual, it's thought provoking. He's so good at articulating the changes that the web makes in our lives.
And in the best web tradition, his ebooks are short, sweet, and free. (Isn't he the one who started that tradition?)
This one focuses on blogging. It's must reading if you have a blog. Think about having a blog. Think you ought to have a blog. Or can't figure out what it's all about.