A group of developers developed a project, called "wi-Go," that utilizes a laptop and a Microsoft Kinect attached to a shopping cart allowing the cart to follow a wheelchair user.
Microsoft's motion gaming preipheral, Kinect, has been a popular choice among entertainment and gaming seekers. Microsoft recently stated that it's Xbox 360 sales were "accelerating." Microsoft can thank the launch of the Kinect motion gaming peripheral for its success in the gaming arena.
The Kinect was launched last year and has allowed the Xbox to increase its sales over time rather than plummit.
Here's the video demonstration of the cart: