Resources
Sociolinguistic resources
Proyecto para el Estudio Sociolingüístico del Español de España de America (PRESEEA) - compendium of sociolinguistic corpora from various cities in Spain and the Americas, transcribed according to a common protocol
El Habla de la Ciudad de Mexico - transcribed interviews from Mexico City for the purposes of sociolinguistic research
Historical linguistics resources
Corpus del Español and Corpus do Português - organized by Dr. Mark Davies of Brigham Young University
Computer software
AntConc - freeware concordancer, developed by Dr. Laurence Anthony of Waseda University in Japan
GoldVarb - useful software package for conducting variable rules analyses