What about a tablet with this sort of design:



The whole point about the PC Security Lock holes on either end is for a keyboard accessory to latch on.
Eg a keyboard/second screen similar to this one:



PS: I will re-edit the image to fix it up and make it look nicer, its just an illustration for now to get your thoughts on the design aspects. For instace, does the idea of sliding doors to cover the connectivity ports (a la Galaxy S) strike you as useful? Does the unibody design seem stylish? etc etc