This box for Thesis 2+ enables the WordPress Custom Header panel in the Appearance menu.
You can position the box anywhere in your skin layout and use the simple WordPress image uploader/editor to manage your header image (located in Appearance > Header in the WordPress dashboard).
This box also adds a meta box to posts and pages allowing you to specify a unique header image for any posts and pages, replacing the default site-wide header image.
You can use this box instead of, or as well as, the site title and tagline boxes.
Download the PDF Thesis Header Image Box Instructions for more info.