I just ran across one of the most succinct and helpful explanations of keywords for stock photography ever written on the Veer site. These guidelines or FAQ’s designed for contributing artists, explain in plain English why keywords are important, how a controlled vocabulary is utilized to map terms, and how ambiguity is the enemy (entering the term chick on an image of a hot babe will map to the term for baby chickens).
Vocabulary and visual resources are two of my main areas of interest and I have done a lot of research on the information available for the users and contributors to stock image sites. The Veer site exceeds any of the other materials I have vetted.
Veer is a division of Corbis and certainly has evolved as a brand that lives up to the promise of an uncomplicated user experience. From the site design and organization to the pricing structure, the content is easy to locate and easy to buy with terms that are easy to understand.