Microsoft has launched the Windows Live Shopping Service today. Give shopping.live.com a try!
You can also checking out Windows Live Shopping Guides and the Windows Live Shopping Tour! They've done a fantastic job introducing a neat shopping system. Using AJAX technology, you can easily get product information just by hovering your mouse over a single product. Buy merchandise anywhere from clothes to music to toys! Of course if you buy something you don't like from Windows Live Shopping, go trade it on Windows Live Expo!
note: posted by Brandon LeBlanc