The list is still small, but...

Silas Kopf marquetry at its best
INLAY.COM american site about inlay, marquetry, intarsia, etc.
Marquetry Society english marquetry society
artmarquetry canadian marquetry society
Atrema french site about marquetry
Hudson River Inlay american company
Spindler marquetry made by Jean-Charles SPINDLER
Helmut Zeiner the old master of modern marquetry
Karin Rost wood inlaying for musical instruments
Friemel Schreinerei one idea better...
Bollinger veneers 
museo Museo dell'Opificio delle Pietre Dure, Florence, informations
stone mosaic pietre dure works; manufacturer in Florence