Here are some links that are interesting to see and read:
http://www.fernandmartintoys.com
http://www.spielmuseum-soltau.de (Klein-Paris)
(with a worldwide forum about spinning tops from now and then)
http://www.antiquetoys.nl
(with folk art toys and sometimes wooden humming tops)
(a website of the co-author of Folk Art Toys from the Polder)
(a website of the Spanish spinning top club)