Redirect Old Slugs Plugin

Redirect Old Slugs is a WordPress plugin that allows you to change the post slug on published entries without breaking the old permalinks. So if you published a post with the slug this-is-my-post-slug and decided to change it to post-slug all links pointing to the old one would magically be forwarded to the new location. Anyone who has ever made a spelling error in a post title knows how useful this will be!