From the Roman Cart site:
We strongly recommend that you create your website using html, and not a server side language such as php or asp. The reason for this is that Google will find your products on standard html pages, but is a lot less likely to if your site is dynamic in php, asp or any other server side language. As Google is driving most sales on e-commerce websites, this is an important consideration. Research has shown that you will make less sales if the area of your site listing your products is not in plain html. Plain html pages can be identified because their address will end in ‘.htm’ or ‘.html’. Please remember this if you are considering using any of our competitors offerings.
I’d REALLY love to see the research in that development – from what I know, that is contrary to much of the popular opinion now adays… especially considering dynamic code is parsed just like a browser when google comes by. Care to comment on that one Roman Cart? I’ve sent you an email.