Phones

Good observations on the market of sync'ing all the directories.

But I'll add this: any such system requires ubiquity, and one could never expect companies to come crawling and drop their existing identity infrastructure. Microsoft tried this and failed miserably, because it's not the companies who want Single Sign-On, it's the customers. To create the network effects necessary for success, the system would need to import and export trust relationships from a variety of other systems. Make it easy for the customer to synchronize and segment their cell phone directory, IM buddies on multiple networks, blogrolls, MySpace friends, corporate address book, blog comment white-lists, little black books, etc.).

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