I had an unused Mini-ITX computer which I can make silent (by removing the fan) as long as it isn't doing anything too intensive, and some spare speakers from a broken CD player... so I put together some remote speakers to play music on.
With some cheap bamboo cane and tie wraps I've mounted them at the head of my bed. The server boots over the HomePlug network allowing MPD to connect to it. I'll add a wireless remote control soon.
