According to theInquirer, Nintendo and Microsoft are being sued for infringing on a crap-load of patents by the company Anascape Ltd. They claim that Nintendo and Microsoft have breached the following patents with their controllers:

5,999,084 “Variable-conductance Sensor”
6,102,802 “Game Controller with Analog Pressure Sensor(s)”
6,135,886 “Variable-conductance Sensor with Elastomeric Dome-cap”
6,208,271 “Remote Controller with Analog Button(s)”
6,222,525 “Image Controllers with Sheet Connected Sensors”
6,343,991 “Game Control with Analog Pressure Sensor”
6,344,791 “Variable Sensor with Tactile Feedback”
6,347,997 “Analog Controls Housed with Electronic Displays”
6,351,205 “Variable-conductance Sensor”
6,400,303 “Remote Controller with Analog Pressure Sensor(s)”
6,563,415 “Analog Sensor(s) with Snap-through Tactile Feedback”
6,906,700 “3D Controller with Vibration”