The Touchkit multitouch interface project just released their hardware and software source docs for your downloading pleasure -
TouchKit is comprised of software and hardware components. For both we provide the source files and welcome you to use, study, and appropriate the code and schematics for your work or projects. We are interested in TouchKit being a plug-and-play solution for simple projects and an easily extendable base for experimental and cutting-edge endeavors.
The TouchKit API is implemented as an addon to OpenFrameworks. With “TouchKit API” we generally mean OpenFrameworks + ofxTouch. Together they form a powerful base for writing innovative multitouch applications. At the moment we specifically support Xcode (mac) and Code::Blocks (windows) with more IDEs following soon.
Sweet – now on to the touching! – Touckit software and hardware documentation download