Photonator

Photonator is an extra strength photo organizer. Use it to identify people and places in your photos, then use a simple point and click interface to search with these terms or any other metadata found inside the images.
Photonator also supports panorama and HDR photography by giving you convenient tools for arranging, processing and tracking result images.

I haven't found anything else out there that does this.
Also use Photonator to identify duplicate files on your disk and eliminate them.