Post and Page taglines? is it possible?

I want to display a custom tagline instead of my page title at the top of my static pages. Is there a way to use custom fields for that?
Ideally, I would like to be able to (when editing a page/post) specify a title, then a tagline, and then the body of the post/page. Is there a plugin for that? is there a hack or something I could do?
I guess that would be considered metadata- Is the ability to do that already in WP (just hidden somewhere)?
My PHP knowledge is less than my wordpress knowledge… All I know of PHP is what i have learned building/editing themes.
I have too many hours logged editing themes though. I built too many to count.
I would appreciate any help/direction I could get towards hacks or plugins… i feel like i have scoured the internet with google, but to no avail.
I am having a bit of trouble grasping the custom fields thing too, so if that is the way i would do this, please advise me in a direction I could go to learn that functionaity.