I suspect that google is already employing techniques to de-emphasize weblog-links. I
remember reading that they had problems with some sites suddenly popping high up in their
results, because a lot of weblogs were linking to the site because of some recent and
interesting event. (Consider it a google-variant of the slashdot effect if you will.)
How they are doing it I don't know, but what you are describing is exactly what google would
want to do anyway: A "real" link is more valuable than one found in a weblog, especially one
in a weblog-comment.
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