OmniOutliner 4.2 is available direct from Omni. (It’s been submitted to Mac App Store but isn’t up yet.)
I don’t think I’ll make anyone too terribly sad if I say that it’s my favorite Omni app. I use it for a bunch of different things — outlining app architecture and features, presentations, articles, and so on. Things that later end up in Xcode or Keynote or BBEdit start out in OmniOutliner. It’s where I think and organize.
Highlights: the new release (here are the release notes) updates the look for Yosemite and fixes a bunch of crashing bugs.
I’m proudest of the crash bug fixes — crashing sucks, and fixing crashing bugs is fun. (Sincerely. I enjoy the detective work.)
My theory about crashing bugs is that they cost more than most developers think they do. They cost you in goodwill (users hate crashes; users don’t think of crashes as acceptable inconveniences) and they cost in support and QA time.
In my ideal universe, all developers everywhere would prioritize crashing bugs over everything else, all the time.