Specifically, how to trick them out on both the desktop and iPad versions of OmniFocus. There are a lot of other good OmniFocus tidbits here, too. Quotable Merlin:

This is made by people who use something called Emacs, which we originally learned about from the Rosetta Stone. No one has really learned what it's for. . . except it might be for everything.

(via Ben Brooks)

Update: David Sparks also dished out some awesome ninja tips at Omni's Macworld booth. As promised, I'm updating my "Learning OmniFocus" post with all this procrastination-defying goodness.