njob is a tool my friend Charles has written for converting photos to heightmaps/normals/AO. It's a side product of our recent indie bungling - not very complex at all, but we thought it might be of use to some of you.
The focus is on speed and ease of use: it's reasonably small, has a simple windows interface, hotkeys for everything, lets you quickly copy/paste to Photoshop and back, and doesn't require any setup. So far it's only been tested among 5-6 people, so any feedback would be much appreciated. It doesn't have a 3D preview yet by the way, though that's a plan for future versions.
Hope you enjoy.
Download njob here