“A small wireless battery powered device – Turn it on near a friendly wireless network that contains iTunes shares and plug your headphones in. It picks a random iTunes share, picks a random tune and starts playing. Repeat until bored or the batteries are dead. The size of the system is amazing. The main board is about the size of my little finger. By default it’s running an ssh server, a web server and advertising itself to the network with bonjour.” Link.
HOW TO – The Radio Babylon