Back when I worked at Sun, there was this idea of Java chips. Scott McNealy had one embedded in a ring. The rest of us had more prosaic badge cards that we could use to login at various Sun locations and connect to the server where our accounts (including files) were stored. But that all depended on network access -- very little info was stored on the card chip itself.
Still, I like the idea of a very small "computer" with storage, OS, etc. that you can stick in any of a number of I/O devices and have the same access. You'd keep it in a PDA sized device while wandering around, but you could pop it into a docking station for full keyboard and large monitor access. We'll have something like that someday. Probably within 5-10 years. (USB drives are almost there now.)
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