The Teres-1 is an open-hardware, open-source notebook designed by Olimex in Bulgaria.
I recently got my Olimex Teres-1 and I must say I really like this small netbook. It doesn't have the fastest CPU, the most memory or best screen, but for most purposes it's good enough. Besides, it's not meant as a high end device but a hacker toy, and one of the first devices which is (almost) completely open. You can download all schematics, all sources, blueprints, everything! This alone makes it an amazing device.