Had a site or two hit, and the drop seemed to be about to 20% of pre-penguin traffic.
If I had to guess I would say sitewides / blogrolls – especially from dodgy neighborhoods – and unnatural over-anchoring are two of the big offenses being singled out, but it’s really tough to say given that so much of what’s now in the top for many medium-competition poker terms is so garbagy and seems to commit similar offenses…