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[edited by: tedster at 6:04 pm (utc) on Aug 1, 2012]
The algorithm just starts to reward any website as it grows in "brandedness".
...In fact, it doesn't give us anything actionable as a conclusion and that's what real analysis should result in: an action plan.
I think some Panda filters for duplicate content might have been tightened.
Independent webmasters should be using Google to visit these big brand sites and then immediately bounce back (and use your friends and relatives PCs to do the same) - if enough people start doing this then there will be a small increase in the bounce rate for these organsations which will weaken their positions in the SERPs.