Easily change the parents of multiple uploads.
Did you upload an image or other item and now want to change it's parent post/page to another one? This plugin will allow you to do that. It adds a new option to the "Bulk Actions" dropdown on the media management page.
The parent matters because the
[gallery] feature simply lists out all uploads that have been attached to that post or page, so this will effectively allow you to move images between galleries.
Joel Sholdice deserves some credit for this plugin and I used his single-item changing plugin for inspiration.