Having tried just about every notebook, organiser and outliner app over the last 3 years, I’ve become an eager convert to Yojimbo. Here’s a little hack that makes the main window use a 3 vertical pane view, like the letterbox plugin does for Apple Mail.
There is a wee bug to be aware of. when you resize it too small, the list pane jumps right and covers up the preview. Clicking the splitter bar (the bit inbetween the 2 panes with an indented dot) brings it back though.
Download
Yojimbo.zip (Yojimbo Widescreen hack)
Installation
This hack is for Yojimbo v1.4. Please make sure you update before installing this hack.
Backup Yojimbo first. Nothing bad should happen, but belts-and-braces, you know? Also, if you get sick of this view and want the old one back, just replace it with the backup.
To install, ctrl-click on Yojimbo in the Finder, choose ‘Show Package Contents’ from the context menu. Navigate to /Contents/Resources/English.lproj/ and replace the OGMainWindow.nib file with the one in the download.