Buy and sell electronics, cars, clothing, apparel, collectibles, sporting goods, digital cameras, and everything else on eBay, the world's online marketplace. Sign up and begin to ...
http://www.ebay.com/

Buy and sell autos, trucks, parts, motorcycles, boats, accessories, and other used cars and vehicles on eBay's online auction site.
http://www.motors.ebay.com/

Download eBay Desktop, desktop application ... Welcome the New: Search, bidding, browsing, watching? it?s all there, with a brand new interface
http://desktop.ebay.com/

Search eBay anytime, receive item alerts, and protect yourself from fraudulent Web sites - Get the free eBay Toolbar.
http://search.ebay.com/

Want to see a quick Overview of the API?
http://developer.ebay.com/