Sensors

• GMU:EEG Sensoren
• SensorWiki
• Gyro-Sensor
• Compass

See Suppliers on where to buy sensors

DIY Pressure Sensor (german):
http://iad.projects.zhdk.ch/physicalcomputing/tutorials/elektronik/drucksensor/

Capacitive Sensing:
http://www.instructables.com/id/DIY-3D-Controller/