eBay decided to do away with Microsoft's Passport system. For those of you that don't know, Passport was Microsoft's attempt at trying to get into every business's customer database. The theory went that you register for Microsoft's Passport and you don't have to register for any other site.
A scary idea if you ask me. Every ecommerce site going through Microsoft. If someone at Microsoft called to ask me what I thought about the idea when they launched it a few years ago, I would have told them the idea sucked and no one would want to adopt it. I guess that should really teach them a lesson for not consulting with me first about major things. :)