I've been watching the news on Google Glasses as well.  Very interesting.  It still has some things to work out, but I had that same thought that it could make for a cool interface.  Might be difficult to control in a plane as voice would be a challenge with the noise and  touchscreen would kind of eliminate the benefit, allbeit it would make for a cool HUD for SynVis or pop up info.  I'll have to keep an eye and see how they progress.  I'll see what Walter's thoughts are too.  Thanks for the post.