There are many mods available for making your shopping portals more SEO Friendly. Here are some of them:

1.   Default SEO Friendly option in Oscommerce converts the site into bit seo friendly mode but the URL’s are not easy to remember, here is the option for that:

Use Search-Engine Safe URLs (still in development) – Enable this option to True and the final Result which comes is www.yourshop.com/product_info?products_id=1 which is indexed by all Search Engines.