Antique Telephone Collectors Association
Antique Telephone History Web Site
Ron Christianson's Cyber Telephone Museum (excellent history and photo site!)
Smithsonian exhibit
Antique Telephone Collectors' News (Japan - great links!)
Bill's Phones (nice photos)
Chuck's Telephone History
French Old Telephones (en Francais)
Henry Dreyfuss - Industrial Design (Smithsonian exhibit on the designer of Bell Telephone's model 500, and many other well-designed things)
Antique Telephones and Antiques for Sale
PhoneCo (online catalog & sales)
Chicago Old Telephone Co. (online catalog & sales)
OldPhones.com (online catalog & sales)
The Phone Man (Boy, this guy really loves old phones! Great site, very knowledgeable, great resource!)