I consider myself to be a techie, but technology like this blows my mind. Cyberkinetics, a company based in Foxborough, Massachusetts, has developed the Braingate:

A pill-sized brain chip has allowed a quadriplegic man to check e-mail and play computer games using his thoughts. The device can tap into a hundred neurons at a time, and is the most sophisticated such implant tested in humans so far.

The chip is advanced enough that the patient can control computer or television functions even while engaged in other activities.