Registering for Yahoo! Shopping allows us to personalize your shopping experience. When you register, you can save your preferences, such as billing and shipping addresses, so they're available every time you shop on the site. You can also keep track of all your shopping carts and orders from Yahoo! Store merchants using the Order Status page.
As a registered Yahoo! user, you can take full advantage of other personalized Yahoo! services, including Yahoo! Points, My Yahoo!, Yahoo! Mail, Yahoo! Finance, and more.