FaceShop is two plug-ins in one:
FS2 works with earlier Photoshop editions in 2D. Select face that you want to transform, go to the two-step process, rotate and paste the finished face on a new Photoshop layer.
FS3, also included, works with the new 3D layer of Photoshop CS3 (not CS3 portable version - 2D only).
If you work with CS3, you can directly paste a real 3D head with texture maps into Photoshop’s 3D layer - rotate live in Photoshop until you commit to convert the face into a 2D element.