Arduino + Wii + Bluetooth = Wirelss Control


I need some help. Does anyone know how to control an Arduino with a Wiimote using bluetooth (wirelessly)? For example, if I press "A" on the Wiimote, an LED lights up on the Arduino. Can someone give me step-by-step instructions on how to do this, including what hardware I'll need (i.e. Bluetooth Shield) and the code I'll need? Thank you!