I also think the pattern of everyone clustering their "google" link exchanges at the bottom of pages is a danger - as I understand it, we know based on certain recent patents (tho the details of which patent have slipped my memory) that google has ways of breaking a page up into areas, in order to seperate out the "content" from headers, footers, and so on.
I personally suspect that links at the bottom of the page, that are not navigation links to pages within the domain, are now raising a flag.
It's a fairly easily detectable form of "overoptimization".
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