Art Cyclopedia
Artcyclopedia: Alphabetical Listing of Jewelers
ArtCyclopedia's complete list of jewelers from the 6th century B.C. to the 20th century. There are links to the jewelers' biographies and works.
Smithsonian Institution
Archive of American Art:metal Matters: Selections From the Papers of Metalsmiths
You can view selected papers of metalsmiths as well as hear interviews with several metal artists.