From what I have been able to find on the wiki and the forums it seems that Crystalfonts vfd/lcd are supported by LinuxMCE but I can't find a howto for installing it. The closest thing I could find is the howto for the MSI Media Live Barebone under hardware in the wiki. I was able to follow that to the point of having to enter something in the 'command line' field of the device template and yes I did use the 'Crystal Fontz USB/RS232 #1722' device template.
Just a little FYI, before I added the device template I plugged the vfd in with usb and it was not recognized and also rebooted and it still was not recognized so then I followed the MSI lcd wiki to the point of the 'command line' then saved template settings and rebooted and nothing on the vfd sceen besides the flashing cursor. I noticed when the launch manager was starting things it hung a while on the Crystal Fontz device. I then checked the launch manager log file and this is what I found,
Not starting device 61 Crystal Fontz USB/RS232 - binary is not found, probably it is in the middle of installation
I then thought maybe the binary that was not found was supported by the lcdproc package so I installed that then restarted but made no difference so now I stuck.