Other sensor sources

Less common Sensor types:

GeophoneSensor, Sparkfun, https://www.sparkfun.com/products/11744
GeophoneSensor, BGmicro http://www.bgmicro.com/GeophoneSensor.aspx
stress, strain gauge
flex, bend, force, pressure (at Sparkfun)

air speed, magnetic field,

Industrial sources, Omega.com