In between people throwing out big fancy concepts like anaglyph, psychovisual, and switching polarizers - I got to see these things in action, and they are AWESOME! Samsung had one that the glasses had a sensor, and as I moved, the 3D plane on the screen moved too. A lot of fun, and makes me look at my fancy HDTV as downright mundane.
The holy grail of this world is a glasses-free 3D display, just like we saw in the first Star Wars. I think it's telling that even in the visionary world of Star Wars, the image is low-def. This stuff isn't easy to do, but it's cool!