Revolutionary User Interfaces
Take a look at this lovely timeline of interface design. It goes way back to the Antikythera Mechanism and marks the most significant steps in UI up until Apple's release of Siri in 2012.
Not only is the design of this timeline a beautiful example of UI design, but the commentary is spot on. Interesting to see Apple has 5 entries in there and it's interesting to see how much has advanced since the Xerox Alto. I felt a strange pang of nostalgia when I saw the Palm Pilot on the list. I have to admit I had no idea what had happened to Palm and was surprised to read that it was bought by HP back in 2010.
Anyway, go look at this timeline. It's good.