The D-roll

The D-roll, or "digital roll," is what designer Hao Hua considers to be a "next generation laptop design," as it does away with the book-like form factor in favour of one mimicking an artist's scroll. Whether or not something like this will even be possible in the near future seems to matter less when you look at how much effort Hua put in the design.

Up above you can see the D-roll set up like a regular laptop, and it's easy to roll up. It also has a detachable webcam you could use on the computer or wear on your wrist.

http://www.thedesignblog.org/entry/d-roll-roll-your-laptop-to-be-a-backpack/

The first commercially available portable computer, the Osborne1

The Osborne Computer Corporation (OCC) was founded by Adam Osborne in 1980 based on a product of not just personal computers but portable computers. Adam Osborne asked Lee Felsenstein to develop his portable computer with the result being the Osborne 1.

The Osborne 1 featured a 5 inch (127 mm) 52-column display, two floppy-disk drives, a Z80 microprocessor, 64k of RAM, and could fit under an airplane seat.

http://www.fastrackcomputing.net/forum/showthread.php?t=594