WordPress mass edit plugins

Currently Wordpress doesn't allow you to add custom bulk actions. Adding them is super easy with this plugin.

Take control of your media. Access all image sizes at the image insert and image link to field. See all attached images in your post listing page.

Regenerate the post (or any other post type) slug on each save. Useful if you want to mass edit slugs for example.

Set posts to categories all at once

WP3.1 multisite "mu-plugin" that allows you to add a user to all sites or no sites. Just drop in mu-plugins.