I never realized you could double-click on the maps. I doubt many non-techie people know this. Also, there have been several occasions where I've specially wan

I never realized you could double-click on the maps. I doubt many non-techie people know this. Also, there have been several occasions where I've specially wanted to know the air distance between two points on Google Maps. As it is now, there's no good (non-hack) way of doing this.