Headers are comments that structure the code, give it logical flow, etc. They might look something like this:

// * Now create the shader program.

(code goes here)

// ** Link our attributes to vertex info.

(code goes here)

// * Render!

Extract-headers gets their hierarchy and displays it on a buddy buffer, with links to their points in the code. It doesn't do online updating, though, so you'll have to update it as you wish. The point will jump to the buffer when you do this, though. If the buffer's already there when extract-headers is run again, it wipes the buffer and re-uses it.

Customize header-starter and comment-starter. Then bind extract-headers or extract-headers-online to a key - and run it.

If I've got time? A dedicated mode, with navigation keybindings. I figure I'll eventually end up re-creating half of org-mode's functionality, though...