Sure why not, you don't even need to keep it THAT close. You just need to convert your 3D videos to this 2x400x480 format and let them play, no problem. Or write a 3D app that will show the same setup from two slightly different angles. Has been on my to-do list to find out if VirtualDub or something could be used to easily convert movies, not that anyone would really want to watch >5 minute movies with eyes uncomfortably fixed on the screen. Might be interesting with some computer generated graphics, for example to see how some design would look like in 3D. Used to play with these when I was into 3D design but been a while since. N900's display is actually pretty perfect for this; lot's of resolution for this small space and much wider your eyes couldn't adjust to without major practicing.

Here's an extremely quick example of how it would look like, photos taken by hand too close with N900 so fuzzy and badly aligned but still possible to get some idea of the 3D effect:


That should be easy to see if you are used to watching SIRDS images, otherwise might be better to practice with them. For some it seems to be next to impossible to adjust eyes properly, for most it does take some minutes of practicing. I need to take glasses off to see them and start from ~15cm close, then draw further back when got a "lock" to the 3D image.