via this auction
"Inspired by the simplicity of the one-string “Diddley-Bow” of Delta Blues, the oneString controller is a super-simple and highly-expressive controller for laptop musicians. It’s designed to be an easy to construct, open-source USB MIDI ribbon controller for musicians looking for a new way to perform and compose.
USB Powered, allowing for only one cable. This means easy setup and portability in our wire-filled lives.
Uses a standard MIDI signal over USB allowing compatibility with almost all music software packages. (ANYTHING that takes keyboard input: Reason, reNoise, Energy XT, Ableton, FL Studio, Max-MSP, PureData… the list is endless!)
Uses free and open-source drivers to allow the most economical cross-platform (WIN, OSX, LINUX) solution.
Uses a minimum of parts, making it cheap and allowing for simple build instruction that even a beginner builder can finish in a day.
Body construction based on simple parts, allowing for everyone to easily make cool unique instruments without a wood-shop or plastics prototyping shop at their disposal.
Uses Arduino firmware allowing for augmentation and support from a HUGE open-source community.
Check out the latest demo on Youtube! : http://youtu.be/1mFMLxMdEss
A wiki for the oneString can be found here: http://wiki.straytechnologies.com"
Videos posted here and here.