PGOR - In-Place Description Editing
I've added in-place photo description editing to the Rails photo gallery software I'm working on. I'm tentatively calling the app PGOR (Photo Gallery on Rails). Adding this kind of advanced AJAX functionality is fairly easy with Rails and Script.aculo.us' In Place Editor.
There's still no user login, so anyone can edit descriptions, but it's a throw away copy of the database, so it's not too important.
A Screencast of the functionality.