Hands down, the best announcement was Sergey Brin walking in on Vic doing updates and demos of Google+. The way he casually walked in and explained that this presentation was time sensitive and the playfulness of doing it in that manner was hysterical. Then, the camera jumping (pun intended) to the blimp over the Moscone Center and explaining that some dudes were about to parachute onto the building doing a live hangout with some computer strapped to their face was incredible. Oh, and then some guys repelled down the building. Oh, and then they BMXed into the conference room. Oh, and then why don't we do the whole thing again the next day and explain it in more detail. Amazing.
Granted, Glass hasn't been super overwhelming since then (I'm an Explorer), but I think at the right price point it could be really beneficial.