Speaking of 3D, one of the entries in a photoshop contest on Fark appeared to be one of those eye-crossing 3D images. It wasn't, but it made me wonder how difficult it would be to turn a 2D image into a 3D stereo pair using Photoshop (or The GIMP, which is what I use).
It turns out that it wasn't difficult at all. There are a couple of small problems with this image, but I don't think it's too bad for a first attempt: