Recently some friends and me were talking about streaming music from iTunes to my dockstar with an usb sound device connected.
I knew there is a solution, so I started some research an found shairport at mafipulation.org. The project looks quite interesting and I tried to set everything up that I am able to play my music remotely.
First there are some dependencies you need to install:
apt-get install build-essential libssl-dev libcrypt-openssl-rsa-perl libao-dev libio-socket-inet6-perl libwww-perl avahi-utils pkg-config
Now all you need to do is download the sources, make and install them:
Get the sources at github.com/albertz/shairport/downloads.