The fantasy is this: I have my laptop -- or tablet, or phone, whatever's nearby -- and by plugging a small pair of display glasses into it, all the things I need can expand on a big virtual display, ...
Google for Android will soon get a feature that will allow you to continue to watch/listen to media, even as you switch tabs.
Spacetop extends Windows laptops to add tons of virtual monitor space with glasses. It should be a preview of how accessories connect with our computers. I started with CNET reviewing laptops in 2009.