According to the
blog post in which Google announced that removal requests would be taken into account in their rankings, they started doing it around the middle of this month.
From the post, which is date August 10:
Quote:
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Starting next week, we will begin taking into account a new signal in our rankings: the number of valid copyright removal notices we receive for any given site. Sites with high numbers of removal notices may appear lower in our results.
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I added a bit of emphasis to the key word there. ;-)