Hm.. there is something going wrong here. I believe that Google knows much more about relevancy than what we think. Consider this example. I have a new website. Very new. New domain, new design and new content. It's about, let's say, cars. Now, I am trying for months to see whether the 'related:www.mycarsite.com' Google command is going to return something. New begin... sandbox... nothing! However - if I install AdWords to my website I notice that all the ads that are rotating there, they are all related to cars. This suggests to me that Google knows. Google knows my website theme.!! What do you think about that?