This is quite ambitious project that actually is useful and interesting. It is a Bluetooth remote control that enables to control PC applications like winamp while mowing around in your room. It has a Nokia LCD screen where you can see the winamp playlist and select desired song. It also allows to make Skype call.
So this is pretty solid thing to have. Let’s see a bit in to hardware. It is based on AT90USB1287 AVR microcontroller that has internal USB interface so no problem to have USB connectivity for firmware uploading via bootloader and charging Li-Ion battery. USB can also be recognized as external multimedia keyboard that allows same manipulation as it was remote. But the main fun thin is Bluetooth to UART module LMX9838 that also can have direct control of audio codec chip W681310. From PC side Bluetooth commands are processed by Winamp plugin that takes care of accepting commands and parsing it to remote control LCD.