Measuring at less than 100mm wide and 17mm thick with a dinky 3" screen, the Ben NanoNote might just be the world's smallest Linux laptop for the traditional definition of the word. While pulling this out in public might get you a few odd looks, the Ben NanoNote actually runs a relatively feature rich piece of software called OpenWRT. It also happens to boast entirely open hardware and software, which not only makes it crazy small, but also Stallman-approved.