Sensors Galore: http://itp.nyu.edu/physcomp/sensors/Reports/Reports
Making Gears: http://www.cs.cmu.edu/People/rapidproto/mechanisms/chpt7.html
Input Tech (sensors etc.): http://www.billbuxton.com/InputSources.html
Kinetic Design Group Matrix: http://kdg.mit.edu/Matrix/matrix.html
