Useful sites:

Victoria Miniland: A unique store in Victoria, that has a full range of miniatures, not only for dolls houses, but for the avid collector.  A must see for miniaturists. Miniatures: Free miniature projects, techniques and materials resource for all scale miniatures, dollhouse and model makers.
National Association of Miniature Enthusiasts:
We do MINIATURES, as “in scale” versions of any and everything in real life.   Dolls’ houses, dolls’ house furniture, dolls’ house kits: it’s all here! We’ve everything you need to create your own charming dolls’ house.