The PizzaBlogger has written a treatise on Coal Fire Pizza that includes a review, a series of photos, an explanation of the oven, and a brief interview with the manager. I haven't progressed to real reporting, so you should definitely read the review. Also check out my original post and the detailed comments that people have written about their own experiences.
The PB's bottom line: Coal Fire Pizza just off Rte 108 is one of his favorite pizzas in Maryland.
(While you are at it, check out the PizzaBlogger's post about open-air movies in Little Italy in Baltimore. That sounds like great fun.)