Ok, so there's been a recent bout of referrer spam from Microsoft. They spam with referrers indicating you rank for search terms you definitely do not. Before, the conclusion was that the words had NOTHING to do with your site (citation) However, I have evidence that you can take the results of the Live.com spam, and get how Microsoft is categorizing your site! Article also covers how this is useful. Full Article Here: Microsoft Referrer Spam Reveals your Site Category!
That article doesn't really make any sense. http://forums.digitalpoint.com/forumdisplay.php?f=43 is the MSN\LIVE sub-forum, a better place to have posted this imho.
There are about a million places where it could fit. I chose this one. I apologize if it was wrong. I added some more background to the article, and discarded/defined a little blackhat lingo. Hope that made it a little easier to understand. Essentially, Microsoft has been referrer spamming. This is common knowledge now. However, in the spam, they were previously using random keywords, pretending they were from the live.com search engine. Nowadays, I believe they are using relevant words as the faked search term. The article explains WHY they are doing this, and how to turn it around to your advantage.