Editing my EXIF

I have spend a great deal of time organizing my girlfriends picture since I want to have them as order as possible. I have had the help of gexif which is an EXIF editor to manipulate the dates where the pictures were taken or modified.

Still the process is very time consuming, I am looking for a batch mode to modify this tags. Today I discover tagmp3 which is a similar way to re-label the meta information about mp3 and vorbiscomments that do the same for OGG.

I wonder however, if there is such tools for the exif meta-tags of the images and if there is such a thing can I implement this easily.

UPDATE: I actually mailed the author of libexif and he gave showed me the exiftool project.