Display attachment's metadata, like picture's EXIF, within your posts.
Resize picture at upload and make thumbnail creation configurable, optionally include a watermark to your uploaded images.
Benjamin Sterling Galleries provides an interface to set up gallery widgets using Picasa / Flickr / WordPress Uploads and jQuery
Picturegrid shows photos from a specific set from your flickr account (or just recent photos) in your wordpress blog, with or without a lightbox.
Power Thumbnail can generate thumbnails with the existing attachment system. It offers two kinds of thumbnails - Basic Resizer & Advanced Zoomer.
Gallery plugin integrated into the WP post and comments system.
photonPWG is a plugin which allows PhpWebGallery (a photoblog) and wordpress integration.
All seems to be one, your users won't see any difference!
Compatible: WordPress 2.0
BlackWater Album Manager is a WordPress plugin developed by
David Mabe (Canoeingkidd). Also, thanks to Owen Winkler for his
RSS link for this tag.