The Smoke Learning Channel gives us a tutorial on how to create 3D effects using 2D Photoshop PSD files:
Download Files: http://areadownloads.autodesk.com/wdm/smoke/media/2D_to_3D.zip
In this video, we take a look at the workflow to import a Photoshop PSD file and import that into Smoke.
You can than position the layers in 3D space and animate them to create a moving 3D environment.
Great uses for motion graphics, bring stills to life and set extensions.