Microsoft asked Google to remove more than 500,000 links

Google recently shared information about the number of takedown requests they get. In July 2011, the point at which its statistics start, Google was getting requests to remove 129,063 links per week. In May 2012 this figure had risen to 284,850. In the past month, more than 1.2 million links on 24,000 separate sites were removed. Requests to de-list links came from 1,296 separate copyright holders. Google said it granted about 97% of requests to remove links and it usually took about 11 hours for any request to have an effect on search results. Just under half of the requests for removals came from Microsoft.

I wonder if Google will be seeing an additional increase in takedown requests with the recent attention negative seo got and someone mentioned on Traffic Forum that he used to send fake takedown requests to get his competition delisted.