An excellent resource for good barbecue is the Campaign for Real Barbecue, http://www.truecue.org. There are lists at the True 'Cue USA link of places that cook traditional barbecue – with wood only, no gas or electrical heat. You also might be interested in my blog, John tanners bbq blog, which has reviews of a whole lot of places – and there’s a pretty recent post about barbecue places in the DC area.