Lileks has a really good Bleat today, writing about traffic jams, compulsive disorders created by old computer programmes, and blogs.
...

Whereas blogs have a different format:

Clever teaser headline that has little to do with the actual story, but sets the tone for this blog post.

Breezy ad hominem slur containing the link to the entire story.

Excerpt of said story, demonstrating its idiocy (or brilliance)

Blogauthor's remarks, varying from dismissive sniffs to a Tolstoi-length rebuttal.

Seven comments from people piling on, disagreeing, adding a link, acting stupid, preaching to the choir, accusing choir of being Nazis, etc.