Yeah, somebody already built that for Google Glass.

http://www.mercurynews.com/business/ci_27234868/museum-2-0-g...

The de Young Museum's partnership with Google, and the exhibit-tour app created specifically for Glass, is one of the most thrilling experiments yet. Billed by French app-maker GuidiGO as the first-ever tour of a complete exhibition on Glass, the augmented-reality effects unfolding within my wearable device made me feel less like a detached spectator and more like a privileged guest at an intimate salon. With one eye on the actual painting before me, I could tap and slide my finger along the Glass stem and call up text or images or an audio interpretation of the piece by Haring's sister, Kristen, who teaches history of science and technology at Stanford University.

Much like Segway became useful only for guided city tours. It's presumably only a matter of time before Segway tour operators start augmenting their operations with google glass heads-up annotations.

I had assumed it would be of great utility to police, fire, and emergency personnel. Of utility for the personnel themselves (pop up display of criminal record info, maps, home owner info, etc), but also for the safety of the citizens (recording, etc) they are serving.

There already are better products for that though: http://www.mygoldeni.com/

Its an app idea, not a brand new >$1K hardware idea.

Guidigo is actually doing exactly this.