iTunes has had the Crossfade feature for a while, whereby consecutive songs will overlap for a few seconds at end-to-beginning. But what if you want the opposite effect: a set amount of silence between each song? But you can't set a negative Crossfade. A Space Between is an AppleScript applet that will wait a user-set number of seconds between plays of consecutive tracks in a playlist. Just select a playlist, or a track in a playlist, launch the applet, and enter a number of seconds.
The tracks will play, pausing for the entered number of seconds between each track.