diberry - 5:16 pm on Nov 20, 2012 (gmt 0)
Considering the SerpMetrics looks at over 100k keywords in different verticals, that would be the best to show the bigger picture.
You're right, I just looked at the free chart, and there's a noticeable upward tick in Google from Friday, maybe even starting on Thursday.
My Penguinized site is shifting keywords, but my traffic is within its usual amounts.
However, I just noticed something really odd: I searched one of my queries I track. I had it set to 100 results per page - the first 22 were from one brand site, and many weren't even very relevant, though many were. Then I switched back to 10 results and got the normal SERPs. Don't know what that means, if anything, but thought I'd report it.