Thank you all for the informative replies. I'll be kept busy checking these links out. I'll let you know what I find.

I had a brief look at a couple. I had no idea that Notecase Pro was cross platform. Thanks. It is, in fact, close but yet so far away. I wish the folders were tags and the tags were folders. The web apps were interesting and ioutliner, in particular, looks like it has potential. But I couldn't find a way to search (could have missed it). I'll take a closer look at the mindmapping links.

Seems like I tried orgmode some years ago. There was something about it I didn't like but I should really take another look at it.

Tom S.

Alexander Deliyannis wrote:

Great to hear that Linux covers most of my needs. I am still working on my own
transposition; I love the OS, but there's several Windows applications I still rely
on for my daily work. Re outlining in Linux, I don't know if you've tried NoteCase Pro (
http://www.virtual-sky.com ) which has been discussed here in the past; it's
cross-platform, very powerful and constantly developed.

To web outlining; the
applications I remember having read about here are:
Checkvist
http://checkvist.com/login
iOutliner http://www.ioutliner.com/
list.it
http://groups.csail.mit.edu/haystack/listit/
Microsoft Listas
http://listas.labs.live.com/

For me, none of the above comes even close to a
capable PC-based outliner, but others' opinion may differ.

However, a similar
kind of webware that seems to be developing rapidly is mind mapping. If you can live
with the appearance, the underlying concept is more or less the same and some of the
apps are quite powerful. Examples include:
Mindmeister
http://www.mindmeister.com/
Mind42 http://www.mind42.com/
Bubbl.us
http://bubbl.us/
Webspiration - web version of Inspiration
http://www.mywebspiration.com/ (Beta, currently closed)

There's many more;
see the whole list at http://www.mind-mapping.org/ and some reviews at
http://mindmappingsoftwareblog.com

By the way, the same goes for Linux; capable
mindmapping applications such as FreeMind and XMind are also available there. Like
it or not, it seems that 'graphical outliners' such as mind mappers are drawing in more
interest than classic outliners.