As TechCrunch reported earlier today, Google is testing secondary search boxes for top retailers like Amazon, Borders, BestBuy, and OfficeMax. While I couldn’t get the searches to work properly, if you search in the Amazon search box (see screenshot below), Google will keep you on Google.com, display the normal AdWords listings, and display Amazon’s content in place of Google’s normal organic results. Also important to note, at least in my searches using the Amazon box, Google highlights its own Shopping search results through its universal search link for Shopping (see screenshot below).

I could only get the Amazon, OfficeMax, etc. search boxes to come up in IE.

Amazon search box on Google:

Results page - Searched for ‘red sweater’ - the Amazon ‘organic’ listings are at the bottom of the page as something is wrong with the UI (see next screenshot). The important thing to note is the use of Google’s own Shopping link and those ever present AdWords listings:

Obviously Amazon’s ‘organic’ listings are supposed to be displayed as Google’s organic listings usually are displayed, but the UI seems to be off: