Model Language Index -- site dedicated to the study of artificial languages, from Adelic to Zireenka.

A Collection of Word Oddities and Trivia -- very interesting, including lists of words containing odd letter combinations "ESSSSE" is an obscure variant for "ashes," and the longest known palindrome, SAIPPUAKIVIKAUPPIAS ("soap-stone seller" in Finnish. Lots more.

Indo-European Dictionaries -- for that late night urge to access a Swedish rhyming dictionary, or to know the Sanskrit word for the French connaître.

The Linguist List -- e-mail question list with linguist moderators

The Latin/Greek Institute -- total-immersion program in ancient languages during the summer that enable serious, highly motivated high school, undergraduate, and graduate students to cover the material normally included in several semesters of conventional work in a single summer.

Internet Resources for French Learning -- moderately useful site. Tons of links.

Acquiring French Vocabulary -- huge list of online places to improve vocab in many areas, many with audio files

Bibliography of Old French Manuscript Tradition -- course page at UC Berkeley. Where else can you find thorough commentary on the paleography of La Chanson de Roland?

Zembla -- site devoted to the life and works of author, translator, and lepidopterist Vladímir Nabókov.