http://www.instructables.com/id/DIY-3d-camera-viewer-with-an-iPhone/

DIY 3d camera / viewer with an iPhone

This came up in the sidebar in related instructables when I was checking my own. This instructable has some nice features like the tags and a direct link to download the app it mentions on iTunes:
Steremaker – iPhone app on App Store. However the photography could be vastly improved and the steps more explanatory.