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[edited by: tedster at 3:28 am (utc) on Mar 2, 2012]
I'm seeing some big changes in the SERP's this morning for some search terms. The data set looks like one from a few months ago to my eyes!
A similar under current running through lots of threads these days: how challenging it is to monitor changes and then think about ways to tweak your site for ranking gains (or recovery).
I can also confirm that I have seen parked domains on 1st page results on several occasions recently.
Add parked domains to that list. Google is broken, wish they would fix it. I've never seen the results as bad as they are right now.
As people spend more time on Google's search site looking through its extensive "entity" database, there would also be more pages, or inventory, on which to place ads, said a person with knowledge of the initiative.