American Translators Association
http://www.atanet.org

Berlitz Translation Services
http://www.berlitz.us

MITA - Metroplex Interpreter and Translator Association
http://www.dfw-mita.com

One World Language Solutions
http://www.oneworldlanguage.com/index.html

Translation Dictionaries
http://www.dictionaries.travlang.com/

TransPerfect Translation
http://www.transperfect.com/locations/dallas.html