Apples' first Iphone? [Apple's secret Iphone design, 1983]
IBM Simon [First Smart Mobile phone. 1993 Also the first smart mobile phone with touchscreen]
Dont miss the Full view of the UI(big file)
EO personal communicator/Penpoint OS 1991 (its 50 mins long, but its
just superb considering its from 1991, so please make time to watch.
you can skip first 8.5 mins if you are in a hurry):
The dev tool demoed in 1994 is not less awesome:
The "Mother of all demos" from 1968 . [more than just the mouse, it was the data management ideas that I liked. We could probably call it one of the first crude "mashups"]
First hand writing recognition was partly mechanical , Nov 1914 (yes, 1914)
Aspen Movie Map 1978 was street view 30+ years before Google introduced street view
First Watch calculator 1977 (dont miss the advanced features)
First digital camera 1975
17000 mile journey on a modified cycle with a solar powered laptop back in 1983
First HDTV (monochrome, 819 lines) came in 1949!
Patent of iPod like device back in 1979
Multi-touch, Multi-pointer UI, And some concepts like magic lenses which are not yet in today's world! 1982 - 1997 . These need not necessarily be invented by the people who demonstrate them in the video.
Xerox Alto :[Desktop , 1973]
Xerox Star:[Desktop, 1982, dont miss screenshots .. search on youtube too]
ATT Viewtron [an older try at Internet/www 1981]
Digital Desk by Pierre Wellner, 1991. Some of the "Envisionment" simulations were also implemented in the EuroParc during this project.
Touch Screen, 
And now let us take a detour from the digital world
P1 electric car by Porsche 1898