Altspace ( http://altvr.com/ ) and Tilt Brush ( http://www.tiltbrush.com/ ) jump out at me. Industrial Lights and Magic has been playing with using this stuff professionally as part of their movie making process: ( https://www.youtube.com/watch?v=IeaLgPMGzkQ ).

Personally I'm a little disappointed that most of the hype around VR has been explicitly focusing on the gaming aspect. The non-gaming applications of VR are much more exciting to me. I want a meditation room, where I can sit on a stormy mountain to think. I want to program in a virtual room with monitors on every surface, and pieces of code fixed in space, where I move to the code instead of the other way around. Maybe it'll work and maybe it won't - its impossible to know until the hardware gets good enough to try.

I think the meditation/therapy angle is going to be a big one. Being able to get away to a happy place of your choice, maybe with a guided breathing exercise, could be very powerful.

Microsoft Flight Simulator X is almost universally considered to be amazing on the Rift.

Digital Combat Simulator is excellent, apart from the difficulty of reading some of the instruments. Completely new simulator feeling.