Bossa with iTunes playlist integration
Bossa 3.1 has just been released and one of the major improvements is the addition of iTunes playlists integration into Bossa. Not only can you now automate and schedule playlists you've made in iTunes, you can also easily go between mixes that you've made in Bossa and your iTunes playlists.
Here is a screen shot of the Bossa mix window showing the iTunes playlists you can play or simply program on a timer in the Bossa Automator.