Mastering SEO for products and conversions is a bloody tough topic. You may have some of the best products going but getting people to find them is the toughest part. Then there's the actual selling of the product. You might get thousands of people coming to your site but if the site isn't easy to use and makes buying products a nuisance, people will give up and move on. Here is a great infographic by the guys behind SEOmoz, the masters of SEO, which gives you a quick walkthrough and some tips on how to raise your conversion rate.