Hi I have just finished setting up my NSLU2 & Firefly so I have a wireless NAS with all my MP3's on which any iTunes client can see in the house. So when I launch iTunes a shared folder appears called House Music which is where all my MP3's live.
It took a while to set up as I tried Twonky Server first which was a pain, but Firefly seems good so far and quite easy to set up.
The NSLU2 was about 461 AED from Jumbo in Mall of the Emirates.
Rgds
gday