Is Google Glass a gimmick or the next revolution in post-PC computing? Time will be the judge - the head-mounted augmented reality device isn't even commercially available yet except to those few who attended last year's Google I/O event and ponied up $1,500 for it--but that hasn't stopped some companies from betting on its future.Related StoriesTwitter's two-step authentication a good start, experts sayFacebook delays Home in Europe, wants a stronger 'First' impression
