Holy hell, I can't believe after all this time I finally got my Mac Book Pro running OS X Lion to run audio through my Mbox 1. There's a demo driver located at
http://www.usb-audio.com/usb-audio_2.0.2.dmg and has a beep every 30 seconds of audio or some such. The full version is available at
https://www.usb-audio.com/get-the-driver.asp but I'm gonna wait until I try and see if the demo works with Pro Tools 9 before I buy it.
If this works with Pro Tools 9 then that's cash saved on a new interface. Will report back later.