Title is the best I can come up with sorry. Is there a way to see what page you are in for a given keyword in google?
Another good and unexpected way is too look at your sitemap report from google's webmaster control panel. Also don't forget to look at your web stat. I find many strange words. For some of it I'm on the top 3 but only less than 10 traffics per month Useless keywords.
Here's a good tool seodigger(dot)com to see if what keywords on your site has rankings in google and msn.