The Music N*** for Mac

From david finucane:

The Music N*** is a simple replacement for iTunes, suitable for parties. It lets your guests queue up songs while locking the screen (kiosk mode) and disabling the playback controls. The name refers to someone who is really authoritarian about music, and the application is designed to prevent fights among such people over what songs get played next and over which songs get to be played all the way through. You can also specify a set of songs to be played automatically when the user queue runs out. Just like a jukebox in a bar, which will eventually play annoying songs at random when people stop feeding it coins.

It won't play over AirTunes since that's a closed (encrypted) feature of iTunes. However there are third party work-arounds for this (a product called AirFoil).

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/.