You might have seen the recent video promoting the concept of Google glasses (Goggles? Googgles?), but if not, Google had a project that hopes to invent eyeglasses that would superimpose relevant information seemingly in mid-air in front of you as you go about your day. The glasses would also include (or be connected to) a GPS receiver and cell phone, so you could get directions, see how close your friends are, and so on. It comes off as a mixture of cool and creepy.
(A similar concept is used in some aircraft and termed a "heads-up display" [HUD] because it enables the pilot to see instrument data without looking down at the instrument panel.)
Below is an abbreviated version of Google's promotional clip, but this time showing you what it might really look like with the inevitable advertising included: