Very Knowledgeable membership, lots of fan information, and a forum for members.
Mechanical Musical Instrument Links
Spark Museum of Electrical Invention
Used to be the American Museum of Electricity. Brick and mortar museum in Bellingham, WA, but has a lot of great information on its Collections pages.
The Radio mAd House
Used to be Radio Grille Cloth.
Restoration of antique and vintage stoves and refrigerators from the 20's to the 60's.