[Amnon] sent in this demo of his groups voice controlled wheel chair. I couldn’t find any details, but sometimes just a demo is enough to find some new inspiration. They connected a hm2007 speech recognition kit to an Innovation FIRST controller board on an electric wheel chair chasis. Additional sensors detect stairs and other obstacles.
WheelChair37 Articles
Line Following Wheel Chair

[Niklas Roy] sent in probably one of the largest line following robots ever built. The Gallerydrive project is used to move visitors around an art gallery. It can follow either a black or white line. It also has a touchscreen display for displaying information about the art which is read from RFID tags. Niklas has a full diary of the build on his site with everything you need to build your own.