Add a tag after expiration
I have a site where I use the Expired tag on all the expired posts. I use a plugin to remove all the tagged posts from the main page of the blog ...where I don't want them to be seen. Of course with this setup I have to manually check (every couple days) for all the expired posts and tag them ... which is very time consuming. I just started using Post Expirator plugin and now will move the expired posts to Drafts area. This way I can tag them all from the Drafts section. I hope that some day your plugin will have the ability to automatically add tags after the post has expired. This will save me TONS of time :-) Keep up the good work!