Cool stuff, thanks for sharing. The parallel and x-eye stuff is kinda tricky for me and kinda gives me a headache. I read an older (50's) book about 3D photography and the author thought that viewing 3D pairs was good for your eyes though and after awhile your eye muscles actually adapt and get stronger. Supposedly good for near-sight in the long run.
But yeah, I think it'd be cool to put those old stereo viewers to good use with some modern images. It's funny though; I took some stereo pictures of stuff around my house and when I viewed them I was like, "ohhh... it's my house, exactly like it always looks!" Haha, I guess you need to find the right subject matter.