While not altogether ethical, if the page has a comments section, some people have successfully removed pages from Google using takedown requests. Basically th

While not altogether ethical, if the page has a comments section, some people have successfully removed pages from Google using takedown requests. Basically they'll post something on their own site and then in the comments on the target site, then file a takedown request saying that the page has copyrighted material on it. This does work at least in some cases.