This application is one of the reasons, why I love Mac OS X. Outliners are not everybody's piece of cake. They don't really exist for Windows or Linux. Maybe because few software designers understand what an outliner is all about. Omni is one of the few exceptions. They get it. Completely. So they created what I consider to be the perfect outliner. It's exactly right. The features and the user interface are perfectly balanced.

I use it to collect and categorize bits of data. From shopping lists to feature comparisons to book chapters. I love it as a creative tool to collect and categorize ideas. I have outlines with less than a dozen and more than thousand entries. Some are plain lists, some are former mind maps, some are future text documents. OmniOutliner makes lots of sense to me. :-)

i use this to make to-do lists for computer work (house calls, server maintenance and such), it is a really useful app to have around and it also helps to make me look just a little bit more responsible when i bring my macbook over to an office and am taking notes on their system(s') issues in outliner. in short, i really like this app.

So glad this came with my Mac!

I use it for presentations, planning and kGTD. Easy to use, elegant and very powerful.

i agree. it doesn't look like much (especially the icon; i replaced the default with this one ), but it's really great for making organized lists of all kinds.

It took me a while to get used to the program (it came free with my PowerBook), but now I use it for just about everything... taking notes in class, to-do lists (or any kind of lists, for that matter), simple databases... its just amazing. The program is very feature rich and still easy to use at the same time. There are one or two features that I think are missing, though (that's probably why they have a more expensive 'professional' version, but I'm too cheap to upgrade :-P).