One of my favorite Blogs, Engadget, has this great tutorial on how to make Make 3-D photos with an ordinary digital camera.

The concept is pretty simple: take two photos from slightly different angles, then lay them on top of each other after changing the color channel info in each. You can do it by yourself in Photoshop or other editing programs, or use the free .Net software app called Callipygian that does the work automatically.