I'm thinking of organizing a local chocolate tasting tour for friends. This was originally inspired by a tour through Fog City News (no longer offered). Any suggestions for places that must be included? Obvious choices are Scharffenberger and Charles Chocolates; also possibly XOX in SF. I'm thinking it could be a combination of chocolate makers and chocolate shops (e.g., Bittersweet). SF and East Bay only. As of now, I'm not sure if I'm going to limit this to places easily accessible by public transportation, or if I'll arrange for cars with drivers.