I've got a website that is ranked #1 on Yahoo for the two words typed in the search "xxxxx coupon". There are 3.5M results for the same keywords. However, I am several pages back on Google and do not even have a PR1 rank. What would cause this? I have submitted the site to many directories but not a massive amount like Scrapbox, XRumer, LFE or some of the others would do.