Telechron clocks:
http://clockhistory.com/telechron, more Telechron:
http://www.bhi.co.uk/hints/cn14.htm and even MORE Telechron:
http://www.telechron.net
Lessons In Electric Circuits (A free series of textbooks on the subjects of electricity and electronics)
http://www.ibiblio.org/obp/electricCircuits
Lotsa various stuff, schematics, etc.
http://www.nostalgiaair.org
Rock-Sea (dials):
http://hometown.aol.com/rockseaent/
Hammond Museum of Radio (yes, those famous transformer folks are still around!):
http://www.hammondmuseumofradio.org/
And on and on. Sorry if I listed any dupes!
And thanks for the opportunity to clear out a few dead links of my own.