Outside of Dogfish there aren't any top-tier breweries in the 3 states, though places like Flying Dog and Clipper City have some interesting offerings. There are tons of smaller places that are pretty hit or miss.
Probably the best beer brewed in VA is at the Blue Mountain brewpub in Afton, just off of Rt 64 outside of Charlottesville. Williamsburg Aleworks (mentioned above) is high on that list, too.
On deck: Little Bo Pils, Bretta Off Dead (Brett pale)
Secondary: Oude Bruin, Red Sky at Morning (Sour brown ale)
On tap: Saison Duphunk (sour), Amarillo Slim (IPA), Earl White (ginger/bergamot wit)
Bottled: Number 8 (Belgian Strong Dark Ale), Eternale (Barleywine), Ancho Villa (Ancho/pasilla/chocolate/cinnamon RIS), Oak smoked porter (1/2 maple bourbon oaked, 1/2 apple brandy oaked)