Add a multi-image metabox to your posts, pages and custom post types
This plugin add a metabox which allox to upload and link multiple images to one post. Pictures are linked by the way of meta_value (and attachments ID). They can be reordered using drag and drop.
Number of allowed pictures and concerned post types can be overited using hooks.
Plugin includes many functions to retrieve linked pictures. For more information on using the plugin, refer to the section "Other Notes".