I'm not big on the idea of SmartGlass for gaming.
I LOVE the idea of SmartGlass for other forms of entertainment.
Specifically...
Live sports - I want to have stats show up of certain players seamlessly after big plays, being able to select from multiple camera angles right on my tablet and to fling them over to my television to switch shots.
If someone is up to bat, I want to see streaks, his batting average, what he did last time he faced that pitcher, etc.
If I'm watching a NASCAR event, I want to see a seamlessly updating grid of all the racers from overhead and being able to switch to dozens of car cams or to listen in to their pit crews.
If I'm watching the NFL, I want to see the play that was last called, check out replays at an instant or switch between games on my TV just by tapping them off a score grid.
I also love the application for other types of programming like reality TV (switching between multiple Big Brother cams would be easier this way than through my laptop), award shows and the news.
Could care less about SmartGlass application with gaming as of right now.