I stumbled across this while looking at an interesting freeware product called "WordService" -- which adds some 32 text manipulation functions to many Mac products (Stickies, TextEdit, etc.). Then I saw this -- another 2 pane outliner with some powerful data organization tools. $35. Looks pretty good. Has anybody tried it?

http://www.devon-technologies.com/products/devonthink.php

Well I took a gander, but the $35 version does not automagically index stuff, so the luster soon wore off and I didn't even install the demo I downloaded.

So far, the Circus Ponies offering seems most solid.