In retrospect, the Testbed Theory maybe a little far out, but now I'm almost sure that Google bought Blogger to bolster its Google News thingy. You see, Google News has a very slow response time - it took the Columbia mishap 6 hours to appear on the top of the page. On the other hand, millions of blogs had found out and reported a lot about it within minutes (including me). So it is for those six hours that Google will be using Blogger's data. Or so I think.
Have you noticed the footer of Google News? It's changed from
No humans were harmed or even used in the creation of this page
to
The selection and placement of stories on this page were determined automatically by a computer program.
The new line accomodates the possibility that blogs were involved.