Change title and footer when Post expires.
Please make your plugin nearly perfect by
1-Adding "EXPIRED" or any other custom word in Post title or heading after post exipre.For example, after post expiration change title from " Get 50% discount on Plugin" to "Get 50% discount on Plugin-EXPIRED"
2-After post expiration, cahnge footer from "Post expires at 10:38am on Sunday September 29th, 2013" to "Post has been EXPIRED at 10:38am on Sunday September 29th, 2013"
Both things will improve the quality of contents and less annoy the visitors.