Dashboard widget for OS X 10.7 Leopard and OS X 10.6 Snow Leopard that shows you the battery status of Apple Bluetooth wireless devices...
MightyMonitor is a dashboard widget for OS X 10.7 Leopard and OS X 10.6 Snow Leopard that shows you the battery status of Apple Bluetooth wireless devices, including the Magic Mouse, Magic Trackpad, and brushed aluminum wireless keyboard.