Aaron Wall gives us a road map of how Google drives business to Amazon, eBay and other platforms. He tells us that smaller ecommerce sites have battled Panda and Penguin updates, and those that have stuck around might have a few options to succeed, which he lays out. But in an interesting comment at the end of the post, affhelper writes: "Would be nice if Amazon started their own search engine. They not only have conversion data but also a decent amount of search data (Alexa.com). I believe that Amazon could compete with Google over search...don't you?" How would Amazon.com use its site search technology to build out a search engine?