SEO and AdWords are my mainstays for my software businesses. This year I'm going to be dipping my toes into a bit of offline marketing, like e.g. going to the (without loss of generality) Omaha Conference For Orthodontics Practice Managers and just talking to people. Given what I currently surmise about the per-account LTVs for higher-end customers of Appointment Reminder, at many plausible guesses for how many conversations I can have per day and how many people I can convert, it might be worth my time to do that. (Step 1: Do it. Step 2: Do it systematically with predictable ROI. Step 3: Pay someone to execute on Step 2.)