Make:

RGBphil made a stunning LED watch, he writes - "This project is a circuit board for making a wrist watch size version of my minidot clock with a few more functions more applicable to a portable device. A lot of help and suggestions came from ians 01/\/atch binary watch. Eaglecad schematic and PCB are available below from the original design, and an updated version with a few corrections is also included. The project is aimed to more experienced electronics hobbyiests as it involves small SMD components, and special programming methods. I'll be going through some of the problems and solutions that arose from making this device. This will hopefully help anyone else attempting to make a small microcontroller device. It might get a bit wordy, if you want action in a hurry....just download the project files and build." - Link.