http://www.owwm.org/ - Old Wood Working Machines Forum
http://www.owwm.com/ - Old Wood Working Machines resource for American and Canadian manufacturers of wood working machines.
http://www.practicalmachinist.com/vb/antique-machinery-history/ - Forum for machines, This is the antique- history section.
http://lathes.co.uk/ - this excellent site has the biggest collection of lathes and information from all over the world.
http://www.ambachtengereedschap.nl/ - this site is in Dutch but most people their can read English and are willing to translate for those who cannot read/answer.
http://www.titaniummetalsupply.com/ For all of your titanium product needs, look to the experts at Titanium Metal Supply.
http://neme-s.org/ New England Model Engineering Society they have the nice Rivett 1912 Catalogue.
www.kaurimuseum.co.nz Very nice museum with lots of information about Kauri and everything related to it.
http://Joellevinecompany.com makers of all types of dials for cars bikes and much more.