Ideas

• motion prediction -- pre-load photos which probably will be needed to load
• automatic generation -- automatically generate galleries from file system
• tags -- normal tags, geo-tags, people tags
• comments -- possibility to write a text to each photo and whole gallery
• timeline -- display timeline of photos
• vast variety of browsing -- browsing photos by time, directory (tree) structure, tags (people, location, other)
• search -- searching by people, locations, full-text (comments, etc.)
• video and voice comments -- attaching audio(visual) comments to photos and videos
• rating -- rating on galleries, and single photos
• slide show
• graphical effect -- e.g. 3D view
• watermark -- automatically add watermark to photos (e.g. for not logged users)
• simple upload -- only select directory and it will upload all photos
• EXIF data
• photo versions -- every photo can have more versions (e.g. main -- default, original, and differently edited)
• grouping -- possibility to join several photos to one group (e.g. several photos of the same thing from different angle or photo sequence); than user can browse gallery group by group and not photo by photo
• face recognition