The American Translators Association is the national professional organization for translators in the U.S. The site includes information on accreditation, full-text articles, going back 5 years, from the Chronicle, ATA's monthly journal, and links to other useful sites.
American Literary Translators Association includes a link to publishing opportunities.
The International Federation of Translators is the major international organization. It is especially useful for its extensive listing of upcoming events around the world.
The following institutions all have formal programs designed to teach translation theory. Many offer online newsletters and also links to other web resources for translators and interpreters.
Binghamton University's Translation Research and Instruction Program (TRIP).
Kent State University's Institute for Applied Linguistics
Monterey Institute of International Studies, Graduate School of Translation & Interpretation,
University of Massachusetts Translation Center.
University of Ottawa's School of Translation and Interpretation. Especially useful is the listing of its theses.