Visit Amazon Light at www.kokogiak.com/amazon4, and you'll see a plain search box that allows you to locate any product in Amazon.com's database. Click on an item, and you'll be taken to a page with the usual product image, price information, and customer reviews, and, of course, the familiar "Buy This" button. Amazon Light's pages are deliberately less cluttered than those at Amazon itself, but the family relationship is obvious.

Look closer, however, and you'll spot some distinctly non-Amazonian features. If the item you're viewing is a DVD, for example, there will be a button that lets you see in a single click whether the same disc is for rent at Netflix. If it's a CD, you can check whether Apple's iTunes music store has a downloadable version. And if it's a book, Amazon Light will even tell you whether it's on the shelf at your local public library.