Work has begun on a set of tools for open source software that will allow for easier creation of tangble interfaces. I am currently working on code for Processing and Pure Data. Once the basic framework for these are in place they will appear online for others to modify and contribute to. Other software will also be extended to allow for easier integration with these interfaces using Open Sound Control.
This abstraction will receive OSC messages and filter them into controlling variables in your sound instrument.
This Java library for Processing will provide accessible data about each object, such as position, acceleration, direction and identification. This will enable rapid prototyping of interfaces.