Evidence of Page Level Google Penalties?
Richard at SEO Gadget showed how Google seemed to have penalized specific pages of his site from ranking in the Google index. The penalty seemed to be fair, in that there were nasty comments that slipped through his comment spam filter.
The drop in traffic can be seen by the keyword phrases that page ranked well for. He noticed a ~70% drop in traffic for that phrase, which in his case resulted in a 15% drop in his Google traffic and a 5% drop in overall traffic.
What I find extra fun is that a Google Search Quality Analyst, @filiber, tweeted:
Google Page level penalty for comment spam – rankings and traffic drop http://bit.ly/JNAly (via @AndyBeard) <- interesting read!
Of course that is not admission to this as a fact, but it wouldn't be too hard to believe that bad comments caused such a decline.
Now, I don't think this would be considered a keyword-specific penalty, which most SEOs believe in, but rather a specific page being penalized.
Forum discussion at Sphinn.
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rustybrick in Google Optimization at June 18, 2009 7:41 AM
Comments (8)

Comments
We have seen a site keep its primary keyword rankings, whilst every single subpage that ranked has been demoted to between 150 - 700 positions.
This happened for the first time last month, and has now happened again.
Posted by C at June 18, 2009 09:24