Some of the evidence suggest that Google have actually been hitting sites in less than a typically algorithmic way and more based purely on a keyword search and fallible manual inspection.

A programmer for one service was downgraded heavily, and had only mentioned his workplace, and a few sites which only had a referral link have also seen a drop.

There also a number of sites I know Matt C reads that have been known to write paid reviews that remain unaffected.

With all the inbound links I have received on this specific subject over the last 2 months, I honestly expected to rank a little higher than the sites quoting me, though most of the links didn’t have very useful anchor text