To install it, install bzr and banshee-extension-mirage, first.:
sudo aptitude install bzr banshee-extension-mirage
Or if you use apt-get instead of aptitude yet:
sudo apt-get install aptitude bzr banshee-extension-mirage
;) Then load the newest version:
bzr lp:autoqueue
Then copy the following three files to your plugins folder:
cd autoqueue; mkdir ~/.quodlibet/plugins/events/; cp quodlibet_autoqueue.py mirage_songs.py mirage_miximize.py ~/.quodlibet/plugins/events/
