Recently I've become interested in stereophotography, and especially in converting 2D images into 3D.
It's a painstaking process, but seeing the result is quite a reward. You can see more of my 2D to 3D conversions at www.dj-design.com
I also take 3D shots using two cameras set apart anywhere from four inches to forty-six inches, depending on the distance to the center of interest. In my profile photo you can see the gadget I built that has the two cameras always aligned.
Soon I will publish my 3D projects on the net, maybe even in this forum.