Blogs are not a fad. They are a new species of written conversation, a complex network of influence spanning everything from political debates to torrid confessions to urgent bulletins from first responders. The days when three network anchors would tell us what to think are gone; now we get to tell one another. Say Everythingoffers close-ups of blogging innovators like Blogger founder Evan Williams, Josh Marshall of Talking Points Memo, exhibitionist...