Zope Photo Album product
Zope Photo Album allows you to organize your jpegs, gifs etc into a hierarchical photo album which users can browse.
Images are listed as thumbnails, (80x80 pix) and the user can choose how many (5 per line) to show per screen full. This setting is stored as a cookie on the users machine and is set for the whole site.
Usage couldn't be easier:- create a photo album (Optionally sub-divide your collection by creating more albums inside the first), then just upload your images as you would to any ordinary folder. The ZPhotoAlbum object takes care of displaying the thumbnails and fullsize images for you!
Get it here: http://www.zope.org/Members/haqa/ZPhotoAlbum