Google patent filing reveals interesting information about ranking
They apparently look at how far in the future your domain expiration is, how your links manifest over time, and how the focus of your site is directed over time, among other things.
It does look to me like, using their definitions, “blog” is largely indistinguishable from “spam”.
http://www.buzzle.com/editorials/6-10-2005-71368.asp
Here’s the actual patent application:
(Note: Google’s name doesn’t appear to be on this patent.)
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