New image available for download with updates of Shairport, raspi kernel and better startup/watchdog scripts.
This is a preconfigured Raspberry Pi Debian build with Shairport. – Thread on Raspberry Pi forums
Write the image to a SD card (4GB or larger), plug in speakers and network, and an AirPlay-capable player will show up on your network once you boot the Pi up.
Detailed build instructions can be found here
2013-08-31 – Updated of Shairport, raspi kernel and better startup/watchdog scripts.
2013-04-21 – First release