A Colorbox/Lightbox plugin for WordPress.
When adding an image to a post or page, usually a thumbnail is inserted and linked to the image in original size. All images in posts and pages can be displayed in a Lightbox/colorbox when the thumbnail is clicked. Images are grouped as galleries when linked in the same post or page. Groups can be displayed in a slideshow within the Lightbox/colorbox.
Individual images can be excluded by adding a special CSS class.
jQuery Colorbox can also open linked content (external as well as inline) in a Lightbox/Colorbox.
Go to the plugin page for demo pages.