[unicornporn]

Nice looking. But I can't use it as is now — it has no tabs/sidebar for more documents. TextWrangler FTW.

I actually run Notepad++ via Wine too for HTML. It's the only editor I've found that can expand and contract a hierarchy of *ML using plus and minus signs in the marginal of the editor. Difficult to explain, I guess you have to try it to understand.

It's indispensable and I can't be without it. I'd love to go native, but I haven't find an editor for OS X that does this.

[tuhdo]

I think what you described is code folding. Emacs/Vim has that too. And more to that. Look for the demos in my other answer in this thread.

[fredsted]

TextWrangler and TextMate has it.

[unicornporn]

TextWrangler is my default text editor in OS X and I haven't noticed this. Do I have to enable it in some way?

[jtth]

Buy BBEdit.