I use Vim Outliner for note-taking. It is an extremely useful tool. However, my files can get long. Vim's folding features are a great way to deal with that: I simply fold up all the irrelevant sections.

What I really wanted was a way to preserve my folds over editing sessions. I found this gem in the vim help documents:

autocmd BufWinLeave *.otl mkview
autocmd BufWinEnter *.otl silent loadview

This automatically executes mkview on leaving a buffer and loadview on entering a buffer -- but only for outline (*.otl) files.

Ah, the joys of a industrial strength text editor!

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