How to make a real iApp like source list?

Dear fellow AppleScripters,

I think we all like to make real good looking applications.
For a long time now I’ve been trying to make a iApp like source list.
You know the nice blue list on the left that Mail, iTunes, iPhoto and now even the Finder has.

It looks a lot like an outline view.
But I don’t know how to get the nice grey section title in it. And with that i mean like the word “LIBRARY” in iTunes.
Or none selectable rows.

I’d like to know if this is even possible. Or is this a challenge? Then maybe we could all try to find nice work arounds to achieve this.

So if you know how to do this, please share it with us all and recieve our eternal gratitude!

Cheers in advance!