Actually, I think the technology is ready. Do you know about the Febreeze Scentstories?
http://www.scentstories.com/welcome.php?flash
Suppose a company creates a movie DVD that combines with a scent "disc"? You play both at the same time. The scent disc would release the appropriate scents to match the movie scenes.
Think of the possibilities! Battle scenes would smell like gunpowder, hospital scenes would smell like antiseptic, rock concert videos could smell like pot, romantic scenes could smell like perfume, outdoor scenes could smell like fresh rain or salt spray, etc.
(You can send my royalty payments to my P.O. Box,
)