ExposePrive
From HAA Best Practices Wiki
ExposePrive is a Joomla extension that allows you to display galleries of photographs with titles and comments. It is free and you can find more information here.
NOTE: The extension at the site linked above is for Joomla 1.1. The version we are using has been upgraded to work with Joomla 1.6 and up. If you need a copy of the upgraded version contact Bill Bean (bill@spillthebeans.org).