The first use of AWS is to generate the product catalog used on the site. A Windows Service consumes AWS methods and synchronizes a local database that contains the products that are displayed on the site. By doing this, we don't have any issues with the 1 request per second limitation as the product information is retrieved from our local database and displayed on the site.
A second use of AWS is the consumption of the remote shopping cart functionality. Again, we maintain the shopping cart information in our local database until a shopper is ready to check out. At that point, we transfer our entire cart to Amazon.com and link the carts in our database. This strategy should allow us greater scalability as we don't make constant requests to AWS to update the remote shopping cart as items are added, updated, or removed.