John has the right approach. The mobile app could work but it seems like it's trying to solve a problem that is caused by the proprietors themselves. In fact, there is a nebulous, possibly large potential customer base that exists between the extremes (dunkin lovers vs woodneck cloth filter snobs). Proprietors need to be the educators; the catalysts to knowledge and understanding. Who is going to take the dunkin lovers and turn them into snobs? The dunkin lovers, for the most part, aren't going to go out of their way to educate themselves. It's kinda the sign of the times. Creating a simplified, direct, focused menu with explanations for different drinks goes a long way to converting casual customers into aficionados.