Thanks for answering a question I hadn't asked, but now someone else has!
I searched for a photo display programs a year or so ago. I want to share photos with friends on my server space. When I looked I didn't find Coppermine, and it looks perfect for me. In fact, the people I want to share photos with also share information with a forum I administer, and it is PHPBB, so with integration for user info, this is even better than I dreamed possible.