According to a LinuxDevices article Realm Systems has come up with a tiny Linux server called the Black Dog. The Dog is 3.5" x 1.75" x 0.5" and weighs 1.6oz. It's based on a 400MHz PowerPC 405 Delta embedded processor and includes 64MB of RAM and 256MB of Flash for $199. It includes a biometric fingerprint scanner and USB client port that offers Ethernet over USB. The USB client port is also used to provide power to the Dog. The intended application is providing a secure workstation that you can carry in your pocket but plug into any available Windows, Mac OS X, or Linux desktop machine without having to worry about the security of workstation (because all your data and programs live and run only on the Dog). It might work for robotics applications with a little hacking to get at the unused PowerPC 405 I/O ports or with some type of USB add on that provides power and some additional I/O. Why bother? Realm Systems is sponsoring an Open Source coding contest for the Dog that includes $75,000 in cash prizes including a $50,000 grand prize as well as other awards. For more details on the Black Dog, see the spec sheet (PDF format).