I've just figured out that I'm in this 950 penalty group.
Here is the wierd thing: the Google results are only now going up to the 700s (there are no longer 800 and 900 position results being shown).
I have no idea why my site has been hit. We have lost nearly all G traffic and are a totally white hat, semi-authority site.
We do have some affilliate links, but they are not the purpose of the site, and are not on all pages.
We did recently put an Amazon aStore on a page - but I doubt that had anything to do with it.
And if affilliates are the problem, then why do we still rank well for the keyphrases pointing to the pages we have with the affilliate links?
But keyphrases that are the majority of our business have been downgraded to the last page.
Maybe this should be called a "last page penalty".
The site is 100% hand-coded html, uses no redirects, no black hat, nearly no link exchanges, and is PageRank6. All pages have unique meta tags, original content, etc.
I'm staying calm, thinking this must be a Google bug that will get straightened out, but am growing more worried as this has been going on since January 14th-ish.