It is always nice to know that there are situations that arise where you can get cooperation from a giant like Google. I enjoyed the article I've linked to and believe you will find the content interesting and very useful.
I am going to quote Jason Lee Miller on 6 points of order: Google will consider a removal request for problem content or problem sites in its search results: (1) If the site is a spam site. (2) If a webmaster believes the site is engaged in buying or selling links that pass PageRank. (3) If the content posted constitutes copyright infringement, which will require a DMCA take-down request. (4) If the site is believed to house malware (viruses, malicious software, phishing, etc.). (5) If a webpage contains personal, private information, request for removal can be made via the URL removal tool. You can read more about it here on WebProNews.
I previously complained about real estate RSS feeds being used to pull traffic to a bunch of hoochies. If you discover you have a problem like I did, it's nice to know that all you have to do is ask Google for a little help.