For anyone who is wondering what I am talking about that blogs can do that a reviewer can't, here is an example.
What David is doing here is criticism, as much as anything you'll see in the Harvard Review. He's digging deeper with PKD's work, connecting it to other literature, speculative or not. But where else but a blog would you see something like this?
He's going to blog Three Stigmata chapter by chapter until the end. Bookmark it now. I just might read the book again.