The second link for "Blogger Google Acquisition" in Google took me here:
Though weblogs are often compared to the frequently introspective and self-focused personal web pages hosted by Geocities or Angelfire, most weblogs are far more interactive, actively commenting on and linking to other web content. This commentary and linking behavior offers several potential benefits to a search engine like Google.
Weblog entries are often concise, pithy abstracts of other web content. In that sense, they function as an enhanced directory listing, of sorts.
Currently, Google and all other search engines look at the text surrounding a link to infer content of the page the link points to. With weblogs this text is often much more "focused" and can offer much more context about a page that's pointed to.
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