Hissingsid - 10:48 am on Oct 14, 2011 (gmt 0)
I've just been playing around with my theory that Panda has at its core LSI/Semantic Vectors.
The biggest $ 2 word term in my niche is like <<widget service>>. Since mid August an unexpected page went in at #1, the page that had previously been in at #3 went to #2 and the long time #1 went to #3.
If I search for <<widgets service>> or <<widget services>> or <<widgets services>> ie with one or two words in their plural form the unexpected #1 drops down between 6 and 14 places and the SERPS return to almost exactly the state they were in pre mid August.