It's not actually a secret, and its something that quite a few countries and organizations such as the MPAA and RIAA have been trying to get Google to "fix." What's interesting, as TorrentFreak points out, is that the suggestions that Google's search puts out as you type a query into its edit box frequently list a torrent as one of the suggestions. You can see that in the query above for Scott Pilgrim vs. the World.
Still, it's interesting that Google, and other search engines, have managed to avoid (so far) changing its algorithms and indexing such that they don't index torrents. We'll see if this continues in the future.