I'm using the Raspberry Pi as an airplay receiver to bring my 1970s hifi system a little more up to date.
Here are the steps I took and some references at the end.
Davids-MacBook-Pro:tmp david$ curl -O http://svn.stmlabs.com/svn/raspbmc/testing/installers/python/install.py
Davids-MacBook-Pro:tmp david$ chmod +x install.py
Davids-MacBook-Pro:tmp david$ sudo ./install.py