An obvious feature that should be part of the WordPress Core, that is. Why are subheadings not available by default? This question puzzled me. I spent a considerable amount of time poking around the guts of WordPress to eventually realize that basic functionality common sense doesn't always find its way into software—even software in 2012.
This plugin makes up for that by adding the much-needed subtitle/subheading/"other field in title" thing to WordPress.
My only critique is that after a recent upgrade to WordPress, it's not working any longer. I hope it gets fixed soon!