Hola, I have talked to both David and Steve about my interest in this project... I am in the process of disclosing some of my research so I am able to share more info, but in the meanwhile, I think using something like Python + PyGame is a very good idea because it would be both easy to program and to modify. Besides, python is multiplatform (meaning the code works in Windows, Linux, Mac and many other OS) I have showed David a python-based demo of one possible strategy for single-switch "free-hand" drawing that may be useful for AccessPaint and, as soon as I am able to, I will make the code available here. Of course, the idea of simply incorporating additional features to TuxPaint is also very good and maybe initially more feasible than comming up with an entirely new thing... has anyone started any work on this? is there any funding available?