I've relied on this application for years and recommend it highly. Apple should buy it and just include it on all Macs as default. The Mac shareware market has exploded recently with all kinds of outliners and idea organizers. I've tried them all but stuck to Mori. The new ones get carried away with bells and whistles. Many also try too hard to recreate the wheel ('being innovative') on the interface...and just end up looking silly. Mori, on the other hand, is simple and its interface truly does make sense. I couldn't live without it.

Note: There were some problems with Mori (around 1.6.8 I think) when OSX 10.5 came out. This was the case with countless apps on the market at the time. The developer quickly fixed them and the current version has never given me problems. Very stable and solid.