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This plugin is adapted from Luc Princen's The Subtitle plugin http://www.to-wonder.com/the-subtitle. It differs in its class-based organization, uses less jquery, and only saves the post meta when needed.

The subtitle allows you to easily add a subtitle to your posts and retrieve it in the loop in the same manner as the post title. By using the_subtitle() or get_the_subtitle().

It adds a simple inputfield right under the title field of posts, pages and any custom post type. It also add a subtitle column to the edit screen as well as to the quick edit.

You can also use the shortcode [the-subtitle] to display it within the post content.