Joomnik is a gallery component for Joomla! CMS displaying multiple images of items grouped by albums. Each item has description and up to 10 information fields. In case of multilingual sites, common words can be translated in the component, or Joom!Fish can be used to translate album and item names and descriptions.

Basically it displays all images from an item's folder. An item can be a model, a car, a house or similar "one" object. If one picture changes, it does not require any operation in Joomla!, new picture(s) and their thumbnails can be uploaded via FTP and that's it!

You can create folders and upload images (also create thumbnails) from the back end, during album/item creation. Also meta keywords, meta description can be added to the gallery, each album and each item.
For more information see: http://www.anetus.com/content/view/15/26/

Last version has a workaround for session problem, when login screen showed up in back-end, preventing from adding images.
It also should work better in Joomla 1.5, with Legacy mode.

It is still not easier to set up, though.. I'm working on native version for J 1.5, which (hopefully) will be easier to use.