I plan to use this display with a Mega1284 chip on a control node for a network I'm developing, (http://busnet.robgray.com/hardware/ncn/index.php), I got some free hardware from 4DS to help me do the job so I better get something made I guess 
I have so much to do on the network design that there's not much point getting too involved with the display right now but I'm happy to look at code, maybe I'll spot a bug or two or have an opinion on the API calls.
I have one question (to both avenue and yot), do you handle landscape and portrait orientations? Presumably it's just a matter of sending the appropriate command to the display then keeping two variables for width and height.
My email is rob@robgray.com if anyone wants to contact me directly.
Rob