I was shown an interesting search result a couple of days ago.
Here are the Google results for the keyword ringtones from January 16, 2007 — notice that the #2 result is Google Docs:
Clicking on the link takes one to the Google Docs page shown below:
This subdomain of the PR10 site google.com is ranking very well for its keyword. It's main outbound link goes to a page on a subdomain of aol.com — the ringtones page shown below:
YourFastFind.org was registered December 6, 2006 to someone with a Chinese address.
The keyword ringtones is often filled with spam, but this case is especially interesting because it's located on a Google.com subomain.
When I was first shown this spam, Yahoo SiteExplorer did not show any backlinks for the Google Docs page. Today, January 20th, 2007, Yahoo SiteExplorer shows 6,583 backlinks to that Google Docs page (including the link from my site), and Altavista shows 11,300 backlinks to that page. It looks like someone used a script to put comment spam in Gallery site and other locations to build up massive link popularity.