Orchid Resources we have found useful

General Culture Information

American Orchid Society Culture Sheets

Internet Orchid Species Encyclopedia

Baker Culture Sheet (Selected species free. Others by subscription)

Genus Specific Cultural Information

Neofinetia Care/Culture

Growing Sobralias

Taxonomy/Registry

RHS Orchid Registry

RHS alphabetical list of standard abbreviations for orchid names

Kew’s World Checklist of Plant Families

Orchid Roots

Pests & Diseases

Orchid Pests and Diseases by Sue Bottom

Orchid Diseases

Orchid Virus Diseases

Other

International Orchid Foundation

Orchid Fragrance Information (species)