We've put a nice audio and I/O board online at Protonoir:
It allows streaming audio from a PD patch to a speaker. It also has I/O, analog inputs, PWM, motor and servo control. One can hookup as many boards as the network allows so that you can make a multichannel audio setup. The boards are powered over Ethernet, so just one cable from an outlet to the board. It also does not matter how far PD is separated from the board, as long as the connection has enough quality.