This is a really nice passive multitouch input by Randall Jones. It was designed to be an inexpensive, and extremely expressive, musical interface. I really like the simplicity, and it only cost about $50 to build. [Thanks Dan]

Physical modeling synthesis has proven to be a successful method of synthesizing realistic sounds, but providing expressive controls for performance remains a major challenge. This thesis presents a new approach to playing physical models, based on multidimensional signals. Its focus is on the long-term research question, “How can we make a computer-mediated instrument with control intimacy equal to the most expressive acoustic instruments?”

More about the Multitouch Prototype 2