I've just been talking with Brian May (the guitarist from Queen, author, astrophysicist, and all around great guy) about just that subject. He's just published a book of stereo imagery, as a matter of fact. He's got some stuff online:
BRIAN'S SOAPBOX
Move your camera a little between two shots of a stationary subject and voila, you have created input for a stereogram.
You can organize the images side by side so that you can view them with crossed eyes, or flipped the other way for people who can move their eyes the other way (I can't).
Here's an image I did the other day of my computer. Cross your eyes to superimpose the two images and see the 3D effect.
-Noel