Delaware Birding Locations: Checklist and site guides to 21 of the best birding spots in Delaware by Maurice Barnhill.
Delmarva Ornithological Society: Bird club for the Delmarva peninsula. Meets in Wilmington.
Mary Scott's Birding Delaware: Travelogue of a Delaware birding trip.
National Wildlife Refuge Bird Checklists: Seasonal checklists for Bombay Hook NWR and Dover Air Force Base.
Tri-State Bird Rescue and Research: Wildlife rehabilitation organization in Newark.