Here's a really cool quadrature encoder and motor driver for the GM17 Gear motor designed by the micro-specialists at Didel.
Use the NunChucky I2C Breakout Board Adapter to use your Wii Nunchuck controller in your own projects!
This is a simple to use light sensor that outputs an analog value from 0 to 5V. With exposure to daylight, this sensor will output 5V.
Detecting temperature changes has never been easier. The MCP9700 is a small thermistor type temperature sensor.