They'll never be popular? I think the main impediment to wearable computing has been how socially awkward it is. If someone actually came up with a discrete, well-designed glasses-based computer, I think it would be immensely popular.

AR won't really come into it's own until such a platform exists. Holding a phone in front of your face is just too awkward.

- read any language

- never forget names

- navigational aids (obviously)

- identify any bird, plant, etc.

- a whole raft of products just geared around augmenting the museum experience

- look at a printed equation and see it solved

- look at a printed question and see it answered (within certain constraints obviously)

- look at binary, hexidecimal, etc. and see it converted to decimal

- look at a color and see pantone and hex color codes

- read existing printed books, but with access to immediate dictionary lookup, references, etc.

I could go on and on... if this ever hits, the ramifications will be extraordinary.