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Reseller has pulled out a post at WebmasterWorld linking to a Google Groups post by a Google Employee saying;
There are a few things to consider about our overall crawl and indexing pipeline. As part of some recent updates (http://www.mattcutts.com/blog/bigdaddy/) we're taking a much closer look at affiliate links, linkfarms, duplicate content, and other factors as described in our webmaster quality guidelines.
As with the Florida update, when Google went after sites that were perceived as going against Google Quality Guidelines, some good & clean sites were hit in the cross fire. With this, the same has happened, and it will always happen.
So if you are suffering, you can try posting in the Google Group or emailing Google, as specified in the thread.
Forum discussion continued at WebmasterWorld.
Comments:
Search Engines WEB
05/15/2006 09:29 pm
Google did admit that a 40-40-20 ration is acceptable for an algo update. They can not attain 100%perfection - 40% of good sites may increase their rankings . 40% will stay the same... 20% of Good sites may decrease their rankings with this basic formula applying to each algo update - the overall SERPs will continue to improve - according to them battellemedia.com/archives/002551.php