DrNewtons.com is an e-commerce site built on a version of ZenCart. This site has some unique features like a fully custom product variants section. ZenCart had a very convoluted method of providing color and size options, so a much simpler model was written from scratch. Dr. Newton's sells many products with variations such as supplements. These can be found in tablets vs. capsules and in many different bottle sizes. The new variants script provides a simple drop down menu that sends a unique PLU code to the shopping cart database for fulfillment.
The site also employs a custom reporting engine that can track many stats such as keyword conversions. The store purchases many keyword ads from Google, MSN and Yahoo!, so it is helpful for them to know what keyword the customer clicked on before making a purchase.