American Sign Language
See video demonstrations of hundreds of common signs in the American Sign Language Browser from Michigan State University.

Ethnologue
A comprehensive index of world languages broken down by continent.

Google Language Tools
Search pages in any language or country, translate text, translate a web page, or use google pages in any language.

Guide to Grammar and Writing
This site offers everything you ever wanted to know about clauses, phrases, sentence fragments, capitalization, subject-verb agreement, and rules for comma usage.

Roget's Thesaurus
An online version of this classic thesaurus.

Webster's Dictionary
An online version of this classic dictionary.