I actually saw Thad in school walking around with his "glass". The Google version looks way better and a lot less geekier (and less creepier) than the thing he used to wear to say the least.
Thad's been walking about Georgia Tech and other places with a wearable computer since 1993. I remember how big his previous version was, but the current version isn't too bad:
http://3.bp.blogspot.com/_sqPHIOY4PBQ/TTtAjzFy6TI/AAAAAAAAAv...
http://hci.stanford.edu/courses/cs547/Resources/Pictures/tha...