Just be aware that, due to some difficulties with getting App Store approval, this version is 10.6 only. (Those Apple-niggling woes are one reason why I use the App Store only when I've no other choice.)
http://blog.hogbaysoftware.com/post/434 ... -os-x-10-5
Note that you can also get Mac TaskPaper and WriteRoom for a bundle price of $27.95. Also, if you already have TaskPaper, you don't need to get the App Store version. This upgrade is free via in-app upgrade.
TaskPaper is a clever blend of outliner and to-do list maker that has versions for Macs and iDevices. I like how it formats separate lines (ideas) as bullet lists. That makes it my favorite way to take down notes-on-the-go with my iPhone. The filtering feature is also quite useful when that list of ideas gets long. There are more details here:
My only complaint is that it doesn't yet do OPML import/export. With that, a basic book outline created in TaskPaper on a iPhone could be imported into OmniOutliner for more sophisticated tweaking or into Scriver as the binder-level structure of a book-to-be. The latter, I am told, is almost magical.
I've not been using TaskPaper as much as I had because the current iDevice version lacks DropBox synch, something that's become a 'must have' for me. That's why I was happy for this news from the HogBay blog:
TaskPaper for Mac and iOS hasn’t had many updates for the past year. The iOS version is soon getting a big update that will add Dropbox sync support.
Ooops! I just noticed that the price is 4 cents more or $4.99. At a price like that, it's well worth a try.
--Michael W. Perry, Untangling Tolkien