Fancybox For WordPress– Seamlessly integrates FancyBox into your blog: Upload, activate, and you’re done. No further configuration needed. However, you can customize it from the Options Page if you like.
Featured Content Gallery – Featured Content Gallery is a plug-in for WordPress which lets you to pick a few posts from a specific category or via post IDs and then display them in a slide show. The slide show is very cool which displays an image in background and description of post in a fading gray box in bottom of this widget.
Thumbnails For Post – Thumbnail For Excerpts search the post for the first image. If exists, than it will search for the thumbnail created by default by WordPress for the image, if it was uploaded from WP administration area. If not, it will show the image itself, but of course, scaled (IMPORTANT: since version 1.2, there is an option to let the plugin to automatically generate the thumbnail where it do no exists.)
SEO Friendly Images – Images can be a great source of traffic as people search for images of various subjects, and this plugin helps you with making sure that you have “alt” and “title” tags on all of your images so that the search engines can properly index them.
Flickr Photo Album – This Flickr plugin for WordPress will allow you to pull in your Flickr photosets and display them as albums on your WordPress site.