Translators and Agencies

Aquarius. The biggest translator data base, both free-lance and agencies. It also has information about software, links, etc.
Spanish translators. List of Spanish translators all over the world. In tuSpanin, with other interesting links.
Glenn's Guide to Translation Agencies.
Transref.
Proz. Includes translators and agencies.
The linguists.com Translator Database. Classified by their source language.
ETranslate.
The Translators and Interpreters Guild. An organization created by and for translators and interpreters.
American Web Directory. Focuses on freelancers residing in the United States.