Stereoscopic photography has fallen out of favor. This is probably due to the fact that people don't like having to wear special glasses to view family snapshots. Here is a fun little project you can make in less than a day to make your 3D pictures more enjoyable to view.
Warning: 3D pictures are ADDICTIVE. You will find yourself spending a lot more time appreciating the simplest snapshots. Next thing you know you'll be browsing ebay for old stereoscopic equipment, blathering on at dinner parties about how much better 3D pictures are than "flat" photos, and spending your weekends making weird stuff to post on Instructables. Read this at your own peril.
If you're savvy with glass and know how to piece together prisms or magnifying glasses to form a stereo viewing lens then you could probably skip this step. The general principle here is that for comfortable viewing, you need to bend the optical path for each of your eyes so that the left image and the right image converge and appear to overlap. This is most easily done with an off-the-shelf stereo viewer by Loreo - a company in Hong Kong that makes 3D lenses and viewers out of plastic.