Basically however your display is connected to your mac either directly via USB or via a usb to serial convertor once you have installed the drivers your going to get an serial communictions port availble to send the data you want displayed through. That seems to be the way that most of these VFD or LCD screens work, whatever operating system you are using.

Your options as I can see them are:
Use the blueCabbie project and be content with the itunes information.
Take the source to the BlueCabbie project and adjust it to your needs. (ie learn objective c)
Start from scratch using the Apple tutorial and create your own interface. (again learn objective c)

Keep searching for somone else who has done the hard work allready.
I break stuff.