itunes server is a simple one.
turn on
set folder or use root (default)
do a refresh if a scan doesn't occur straight away
go to itunes on your pc/mac, in sharing you should see your DNS-320, click and hey presto you get all your mp3s etc
just a shame how it shares stuff is poor, no album art support, no folders etc, i had to create a playlist for every album, not the dns' fault, all apples