Cross-cultural wedding planning. You'd be surprised how few flowers don't mean "I'm sorry your mother died" to somebody!
Sorry, just kidding. The center of gravity of my business is a moving target. As of present, it is consulting, largely on marketing topics for software companies. Not where I want to be for forever but, well, wedding to pay for.
Appointment Reminder is coming along decently well -- the enterprise pipeline is starting to bear fruit, finally, and the self-serve is quietly growing every month. BCC remains my fun little laboratory where lab accidents can't kill anybody. I will probably have some sort of productized version of consulting services available sometime after the wedding -- maybe August, who knows.
Basically following the 37signals model: subscriptions-based SAAS. Pretty neat stuff - i'd do that in a heartbeat over iOS apps if my ruby-on-rails skills weren't so rusty.