Pattie Maes and one of her students, Pranav Mistry, demonstrated a system they've been working on to "augment" a user's experience of the world by delivering relevant information about certain objects, as well as allowing the user to interact with that information.
Pattie Maes and Pranav Mistry demo SixthSense
I've imagined something similar in the form of glasses that record your eye movements and cross-reference that data with recorded images of what's in front of you with to determine points of focus. Then, theoretically, they could display information about whatever you're focusing on onto the glass of the spectacles. Pattie Maes takes it in a slightly different direction when, at around 08:30 in the video, she says, "who knows, maybe in another 10 years we'll be here with the ultimate 6th sense brain implant."
Regardless of the interface (fingers, eyes, brain, etc.), is this something that would be good for humans?