(No, it's not a suppository.)
Trolltech has released phonon backends for GStreamer, DirectShow, and QuickTime/CoreAudio, and will be maintaining them in the KDE codebase!
I guess it's time to start another build and see how Amarok sounds with nice CoreAudio output.
w00t!
Can't wait!
Unfortunately, it appears that the QT7 backend only compiles on Qt 4.4. Stay tuned though.