• EXIF support (Stefan Wallström claims to have a halfway Pike implementation ;)
• MySQL based
• Build thumbnails in a batch-oriented process (offline)
• Reasonable defaults (point at a tree of images, let it figure out what to do)
• Work on remote directories/sites.
• Metadata: title, photographer, subject, people in the picture, etc
• Search on metadata and fulltext comments
• Comments, like pike-community
• Rate photos
• Access Control
• Rotate pictures
• Batch mode image manipulation (sharpen, soften, change contrast/brightness etc)
• Retain image timestamps
• Customizable
• Maybe have two modes? One "fixed" easy-to-get-started version, one custom version that lets you do the layout yourself.
• Extensible
• image manipulation plugins
• navigational interface template plugins
• "action" plugins, e.g. "Send this picture to an online photo print company"
• Multilingual?
• Easy to configure bandwidth throttling control
• "Previous images", "Upcoming images" (show previews of n images backwards/forward)
• FTP upload support
• HTTP upload support
• Show pictures in different resolutions. Generate on the fly or beforehand?