Someone is always working on a way to let differently-abled people interact with virtual worlds and games. This video shows someone playing World of Warcraft using a system called the Eye Gaze, which tracks eye movement and somehow (I'll say magically) converts the signals into mouse clicks and WASD movement.
This could be big for people with conditions that affect motor control, such as muscular dystrophy or polio. There's also a Second Life demonstration video. Though the team's website is currently down, there's a lot of food for thought in these videos. I can see a system like this dramatically improving quality of life for people with crippling disabilities, and also for, as one commenter put it, 'insanely lazy people'.
Videos after the break!