Opt+Tab cycles through Note > Text Pane > Attributes > Note. (If you’re not showing Key Attributes then it’s a straight toggle between Note and Text.)
This works in Map or Outline view and is very useful.
(BTW Mark – this shortcut is in the keyboard list 
)
The only problem with the shortcut is that it conflicts with a standard Mac Text feature: opt-tab is normally used to insert a bullet beginning with -.
Unfortunately, the shortcut and command are hardwired into Tinderbox, otherwise I’d remap it to something else – it’s not on a menu so I can’t. Opt-tab for bulleted list is a very useful feature which I use all the time and it’s a shame it’s not available in Tinderbox. I think I put in a feature request a few years back to be able to remap, but of course, it’s not a huge priority in the scheme of things.
(Mark: Ctl-space is the standard Mac shortcut for change keyboard input, essential for multi-language work)