Google has been working on a concept called 'Project Glass.'  It's basically a mini-computer built on to glasses.  The computer responds to voice commands and can do anything from giving you directions via Google Maps, taking photo's and video's, and surfing the web.

Check out the latest video to be released by Google promoting their Google Glass.

According to Wikipedia, the glasses are scheduled to be released to consumers late 2013 or early 2014.  Google Glass is expected to be introduced in the market for around $1,500.