iQueue
With iQueue it's easy to select a song in iTunes and add it to your queue
Music is great! That's why you've got an iTunes library full of it. But who wants to spend more time finding a song in iTunes, and then waiting for it to end so you can find a new one, than actually enjoying your music?
With iQueue it's easy to select a song in iTunes and add it to your queue, a list of songs that will play in order automatically, without interrupting the currently playing song.