We were recently contacted by a site that will list us (on a CPC basis) in the page they have dedicated to our site's niche. They are getting great results for all of the pages in other niche, but I just can't figure out how. They have way less PR than my site which is an 8. We have more backlinks than they do, but they still do better in some fields than we do, and we have optimized like crazy in an attempt to grab positioning.
So, my question is this... if they are cloaking, how do I find out? Is there a sure fire way to test for this?
Thanks.