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EyeWriter Its a very interesting and altruistic initiative lead by Graffiti Research Lab, and many other talented people like Zach Lieberman Buy Viagra Online .The EyeWriter. It is a low-cost eye-tracking apparatus + custom software that allows graffiti writers and artists with paralysis resulting from Amyotrophic lateral sclerosis to draw using only their eyes.
They have teamed up  a legendary LA graffiti writer, publisher and activist, named Tony Quan, aka TEMPTONE. Tony was diagnosed with ALS in 2003, a disease which has left him almost completely physically paralyzed… except for his eyes. This international team is working together to create a low-cost, open source eye-tracking system that will allow ALS patients to draw using just their eyes. The long-term goal is to create a professional/social network of software developers, hardware hackers, urban projection artists and ALS patients from around the world who are using local materials and open source research to creatively connect and make eye art.

The Eyewriter from Evan Roth on Vimeo.

For more information go and checkout their site. You will find plenty of stuff about the project and even the DIY instructable to make your own EyeWriter.