It's interesting the comments on having trouble with "crossing eyes" when viewing my stereo renders. I've never had a problem doing so, and just assumed others could do it as well. I view mine very easily at full size (although I don't do it for many minutes because I do feel the strain).

Jim Burton, when I cross my eyes on your image above, the depth perception is reversed; that is, the cannon is closer. The images are arranged to be viewed in a parallel fashion (the "parallel" approach). The images are reversed from how I present mine (the "cross-eye" approach). I've read that to see the parallel type requires de-focusing until the images join in the middle or the use of a stereoscope (3D Viewmaster, anyone?)...while mine requires crossing the eyes. I've never been able to see the "parallel" type properly.

I do not enjoy anaglyphs much at all; I can see so much clearer using the "cross eye" format that anaglyphs seem a very poor second.