;-) With a USB port, one should (theoretically) be able to add a hub, and then a keyboard, mouse, floppy drive, and so on. This could allow one to install any software desired, including productivity software such as MS Office and so on. Add a network port and notebook computers are looking at competition.
Of course, using such a thing without bringing the keyboard along would be awkward, but there was a battery powered laser beam keyboard announced earlier....