Originally Posted by CatOne
If you delete ~/Library/Application Support/OmniFocus it's going to get rid of your database and preference files.
Perhaps CatOne meant your database and perspective
OmniFocus' preferences are actually kept at:
You'll also find the SQLite database cache and Spotlight metadata at:
If you've installed any scripts, you might also have this:
And finally, if you installed the Clip-o-tron 3000, you might have an alias at: