How Do I Make a Custom Post Type That is a Single Post Only - To change the tagline on front page

Hello,

On the front page of a client's website I need to display a tagline. And the tagline text must be editable in the Admin Area in a user-friendly way. What do you experts suggest I use to do this? I don't really like doing this via a widget because I don't want them to bother w/ widgets.

I am familiar with and enjoy how Custompress creates a simple UI for custom post types. Is it possible to accomplish what I need in Custompress, or is that overkill? Custompress seems ideal for custom post types for multiple posts, but can it be used for a custom post type that only works on a single post (i.e., a home page tagline)?

Thanks as always guys. Cheers!

AC