* List untagged images? * Allow queries, e.g. tag conjunction, disjunction and negation, images without tags, etc. * Show uploaded images after upload. * Selectable image sorting. * Allow limiting number of thumbnails per page. * Fix the goto next page feature implementation. It seems very fragile. * Stay on the same page when switching to/from admin mode. * Allow flexible thumbnail box heights. * AJAX add tag. * Changing (deleting, adding tags) multiple images. * Rotate image using EXIF info. * Allow tagging tags? * Authentication? * Use more efficient representation of contents of uploaded files.