You can also do this with optware, hopefully this will work on the pi already without any porting.
I"ve got a Western Digital Mybook World NAS and there"s a few hacks you can do as shown in the below link.
http://mybookworld.wikidot.com/optware
I also found an easier way using a script, one line copied and pasted off the below french site and i was up and running with their packaged install.
http://highlevelbits.free.fr/i.....38;lang=en
Hopefully guides like the first link are provided for people to understand how to set up their pi and get an understanding of linux, but also with a quick install link and photo guides like the second.
10 + 1 = 11 and so much easier to work out than captcha!