I would tell you that I am an expert OmniFocus user but it’s a lie. I am expert at the specific bits of it that I use daily. (Hourly.) (Minutely.) David Sparks knows the whole thing and now shows it to you.
He’s done this before with the original OmniFocus in a whole series of screencast videos but now he’s done it more in the form of his Field Guide books. These are all very good, very excellent books that seem to cut through complex issues and just tell you what’s what and what you need to know now. Somehow they are that relaxed and yet by the end you know everything. The books are particularly fine pieces of work and now there’s a video one for OmniFocus.
As expert as I think I am, I know about this new video because I’m on the guy’s mailing list and it can’t have been above four minutes since I got the email, checked the sample, bought the whole thing and came here to tell you.