I got it working within a couple of minutes today by simply following the instructions in this thread...
Download the IPK from:
FTP it to /tmp/Code:http://code.google.com/p/airplayer/downloads/detail?name=enigma2-plugin-extensions-airplayer_0.1.10_mipsel.ipk&can=2&q=
Telnet to the box and type:
-opkg install python-misc
-opkg install python-shell
On the VIX menu, press Install Local Extension and install it. Works without any problems.