Check out Junkstream. They’re a product search database. Think Feedster but instead of for news but for products. The cool thing is that they’re using RSS and Atom feeds to add products to their database:
There’s no charge to list your products on Junkstream. Simply submit the URL of your RSS or Atom formatted product feed and our search engine will automatically add your listings.
Pretty sweet and pretty easy to add. Very RESTian and very easy!