Professional Organisations
The Australian and New Zealand Society of Indexers, a great resource for training and information in the Australian context.
The American Society for Indexing advocates for indexing by organising conferences, providing employment info and producing publication. They have a specialist group for taxonomies and controlled vocabularies.
Taxonomy and Indexing Links
The Taxonomy Warehouse, everything you every wanted to know about taxonomy plus a plethora of resources.
ACACIA is a non-profit organisation for information architects. Although this site is no longer updated, it is a good resource for taxonomy and vocabulary information as it relates to the field of information architecture.
A'Glosso-Thesaurus' for the world of controlled vocabularies.
Further Reading: Articles, books and blogs
The go to guide for an overview of thesaurus principals and practice.
Heather Hedden is a prolific writer and educator on all topics taxonomy, her book'The Accidental Taxonomist' is practical and thorough.
An informative-and accessible for beginners-article by Lars Garshol,'Metadata? Thesauri? Taxonomies? Topic Maps!'