Here are the articles related to wheelchairs that have been clogging the tubes...
First, the laser guided docking wheelchair.
Next, the NOA wheelchair. Discussed more here.
The Pegasus wheelchair concept can extend to a near standing position, which I have been told is not comfortable for people
A semi-old New Scientist article on EEG controlled wheelchairs. (Medgadget has a video.)
And lastly, extreme wheelchair sports (I feel like I posted this already, but it was still in my reader.)