Pinball machines seemed to be a good subject for stereo photography, since they are very intricate. Here are 3d images of games that I own or have owned in the past.
To view the stereo image, click the preview. This will launch a Java applet which will let you change the size and viewing method to suit your tastes. I recommend "parallel" viewing mode and 25% size for beginners. Just relax your eyes and let the images drift into each other until they overlap perfectly. With practice you will be able to do it almost instantly. If you have trouble, reduce the size further with Ctrl-o. Backing away from the monitor will also help, but the ideal situation is a pair of maximum size images seen from your regular viewing distance. I cannot do this with parallel viewing, but cross viewing seems to allow much larger images to be viewed. (See below for links to tips.)
Equipment: The most recent pics (NF) were taken with a Nikon Coolpix 8800, Kirk BH-3 ball head, and Manfrotto 3021B Pro tripod. (The Arca-style mounting plate on the BH-3 allowed me to shift the camera about 3" between exposures with good registration). Lighting was from SP Studio strobes. The older photos were taken with a Nikon 990 and a home-made stereo bracket under poor lighting, and will be re-shot someday.
In my experience, parallel viewing is easier, but it only works for small images. If you can master cross viewing, you can view much larger images and enjoy greater detail. A pair of 800 pixel wide images looks great!