The Squeezebox is a network audio player that can have LinuxMCE audio streamed to it over the wired or wireless LAN. The Boombox model has integrated stereo speakers and the Squeezebox & Squeezebox Receiver need to hooked up to an amplifier or powered speakers. They allow you to create multiple 'zones' of audio in your home...use an Orbiter in your home to select some music to play and then use the Media Floorplan to select you Squeezeboxes and that it.
Doesn't a Media Director do the same thing (plus more)? Or is this to be used in a room that doesn't have a MD, and you only want to add audio?