> could you post an explaination of what you mean by outliner?

Sure...

An outliner is an editor for hierarchically structured text or other content.

The first outliners appeared back in the '80's (ThinkTank, More!, and Ready
come to mind), but have not survived as a separate product category.

However, their legacy lives on in modern projects.  Probably the best known
example of them is the Outline View in Microsoft Word.  I've adopted this model
for my outliner.  Of course, Vim outlines are pure text instead of a M$
proprietary file format.

Here's the model:

Headlines establish a hierarchy.

Headline levels are determined by their indenting (1 tab per headline level).

Headlines may be collapsed, in which case you just see the headline and the
first line of its text, if any, but not any of its sub-headlines.

Operations on headlines affect their text as well as subheads.  These include:

* Promote/Demote (decrease/increase the indent) 
* Cut Paste before/after
* Yank (copy)

You can quickly determine how many levels you want to display, so you can zoom
into and out of the structure.  If you do (for instance) \2 then only levels 0,
1, and 2 will be shown.

Headlines may have attached text.  I've used pipe characters to mark text
blocks, so a piece of an outline with text might look like:

Level 0
	Level 1
	| Level 1's text
		Level 2
		| level 2 text
		| another line
	Another Level 1 heading
		Another level 2 heading

Because there's both text and headlines, I've also supplied two operations that
extract a subset of the outline to another buffer/window:

* Extract text (gets all the text, removes comment characters, reformats).
Will include headings marked with "+" signs.

* Extract heads

Also see some web sites that discuss outliners:
http://www.outliners.com/
http://frontier.userland.com/stories/storyReader$307
http://john.redmood.com/organizers.html
http://radio.weblogs.com/0001215/stories/2002/03/04/insideOutliners.html