If you are using an itunes library from a shared disk (i.e. a hard disk from another computer) you have to mount an entire drive at a time, not just (say) your remote home directory. The mount point should look something like /Volumes/Macintosh HD-1/.
For the favorites feature, which lets you pick a default set of songs to play when the user playlist has run dry, you can use quotes around artist names containing spaces, if you are picking more than one artist. For instance to play all songs by blue october and placebo by default, the search string would be:
"blue october" placeboand you'd click the "or" radio button to include both artists.
If you are like me and have no hip hop music and a guest complains, you can have him bring his CDs in from his car and import them into your iTunes library. Then you can 'Reload iTunes Library' from the 'File' menu (command-R) and the new songs will be available from within The Music N***, without the music ever having to be stopped.
The name refers to someone who is really authoritarian about music, and the application is designed to prevent fights among these people over what songs get played next and over which songs get to be played all the way through. The original name and icon were uncensored, but VersionTracker users complained, so they had to delist it after just 8 hours.
See this pie chart showing the download distribution by country.