Small businesses already have appointment scheduling systems. Do you plan on integrating with them? Or is Appointment Reminder meant to replace them completely? Or do you expect your users to manually input their appointments into two separate systems?
Some small businesses certainly have appointment scheduling systems. One thing I have heard a few times from folks is that they're using Pencil and Paper v1.0. I plan on listening to my customers and iterating appropriately. If it is obvious that their needs include interop or importing, then there will be interop or importing.
In my wildest of fever dreams, solving a revenue-draining pain point is enough to establish a beachhead in the B2smallB mini-enterprise environment, and then I get to eat the elephant from within. ("Since you're already using me for scheduling..." Basically, a 37Signals style approach where each additional product adds synergistic effects from existing customers plus marginal revenue.)
Small businesses already have appointment scheduling systems. Do you plan on integrating with them? Or is Appointment Reminder meant to replace them completely? Or do you expect your users to manually input their appointments into two separate systems?