http://www.frederickcollection.org/collection.html

A great collection of restored instruments used for concert programs. And the
Fredericks are very nice people...
http://fractales.inria.fr/~louchet/perso/pleyel.html

French piano page dedicated mainly to Pleyel.
www.erard.nl
Fritz Janmaat's Erard site
http://schweighofer.tripod.com/

Calin's Schweighofer site