That moment in Star Wars, where R2 plays back a Princess Leia's message in hologram form was awesome to me. The idea of watching shows, movies, commercials...in a floating format is beyond cool. We are fast approaching these times. There is a ton of work being done on better visual holograms, also ones that encompass touch as well.
To get a very primitive feel for the beginning of this trend, try this project.
I'll be making this soon.