My first remotely useful Arduino sketch

I want to use the arduino to interface a small graphic LCD to my satellite set-top-boxes.
The problem with most of the boxes you can buy today is, that they only have a one-line, 12-16 character text-only VFD display and no longer the nice credit-card sized graphic LCDs the old dbox2 or dreamboxes had.
Most new boxes have an USB port,though, so interfacing the LCD via USB is pretty easy.
The code (both arduino and a small test program for the box) is here on gitorious. The protocol is primitive but pretty efficient on RAM and it does recover from errors surprisingly well. The update rate of maybe 10 FPS is enough for this kind of usage.
Now I need to implement some "display driving daemon" which can be interfaced easily with the set-top-box software.