I recently finished Scott Rosenberg's book about blogging: Say Everything: How Blogging Began, What It's Becoming, and Why it Matters, which is now out in paperback. It's a good book and I heartily recommend it. He recounts the early history of blogging and some of its more notable personalities (A-listers, mostly), as well as inside stories about sites like Gawker and companies like Pyra Labs and people fired for their blogging. But he spends a lot of time on the question of to what extent blogging can replace traditional journalism, which I found especially interesting. I wish he's spent more time on where blogging is going, but perhaps he doesn't know more than anyone else does.
Rosenberg is a good writer with an enviable talent for finding exactly the right word. I hope he writes a follow-up book in ten years on where this decade has taken the Web, and how the greatest communication medium in history is changing the world. One way or another, it will.