Google Glass use test by Dutch Fire Department (+video)
The Amsterdam Fire Department is testing possible use of Google Glass by it's firemen (and women as seen in video) to scan equipment, get updates, do pre-checks and get on-site instructions all through Google Glass.
Actual usefull case for Google Glass. (other than Medical possibilities, car-engine instructions etc)
Note the Dutch fireman asking for "the back-side diagram" ,charming Dutch accent included.