Reviews are good for your business; they help customers make buying decisions, and they help search engines find your site.
The trick is getting your customers to review the products that they purchased.
This contribution sends an email to every customer asking them to review the product(s) they bought.
It can be scheduled to run a fixed number of days after the order has been marked completed. The
email that is sent is based on a template, so it is easy to modify to suit your business.
Support in the contribution forum thread here: http://forums.oscommerce.com/index.php?showtopic=280181