Quikwrite seems like an interesting graffiti replacement. It seems like a steep learning curve, but then could be 2-3x faster than graffiti. It can be found at: http://mrl.nyu.edu/perlin/demos/quikwriting.html

Has anyone bee able to download the demo (version 2)? If so, could you please email it to me, I can't seem to get it from the server.