eBay's API based business model

eBay say their model allows them to release a new version of the site every two weeks without slowing or stopping trade. Thats pretty amazing, and they think other companies could learn from them. Sharing APIs is common practice for software companies, but eBay, along with its fellow online-retail pioneer, Amazon.com, is breaking new ground in its industry by establishing a large community of outside developers. And the implications of this strategy go much further than the world of auctions and electronic storefronts.