from the Linguist List: resources for students and teachers on English as a Second
Language, English as a Foreign Language, and second language learning.
DARE "seeks to document the varieties of English that are not found everywhere
in the United States--those words, pronunciations, and phrases that vary from one
region to another." Includes a few quizzes, so you can test your own knowledge
of regional vocabulary.
James Crawford's site on language policy, including English Only movement, English
Plus, bilingual education, endangered languages, and language rights.