I just submitted some code to get a serial Point of Sale display working with LCDproc. My display uses the AEDEX protocol and seems to work great. I will post the code here shortly.
When used in conjunction with GrowLCDproc, you can show your current iTunes songs or any Growl notifications on the display.
Update!
The LCDproc distribution now contains this driver with the name serialPOS. I have also added a feature to allow input from an RS232 keyboard or terminal through a serial pass-through port.
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