Erni:
This joba small portable arduino support platform
I was under the impression that the OP wanted something that was easier to carry around than a laptop and easy to hook up to the Arduino. Guessing preferably with a touch screen.
Have you seen an example that has been more "small portable" than a laptop?
I'm not saying that it can't be done because it can but I haven't seen any very slick solutions including display and at least some kind of input device. I would definitely like one 