A Chicago Sun-Times article on blogging gives us a field guide to blog classes:

Linkage Blogs: The most classic-style blog, its individual blog entries are links to other sites on the %u2019net, embroidered with brief descriptions. If the person operating the blog has interests similar to yours it's a lot like having a TiVO for the Web. Someone else is sifting through the mounds and mounds of junk, and reporting back on just the links that might interest you.

Info Blogs: Is the office print server available, or offline? Schools, companies and local businesses use blogs as a way to keep folks informed.

Boswell Blogs: Like Boswell's London Journal or Pepys Diary, this is a street-level account of an individual life. It's the most interesting and exciting type of blog by far.

Barbie Blogs: Like the Boswell Blog, except the blog entries are of interest only to the writer, the writer's immediate circle of friends.

...via The Shifted Librarian