American Sign Language Browser
An online American Sign Language (ASL) browser where one can look up videos of thousands of ASL signs and learn interesting things about them. From Michigan State University. Uses Quicktime.

Sign Language Dictionaries Online
Reviews of several sites which feature American Sign Language dictionaries. From about.com. Links.

The Nonverbal Dictionary of Gestures, Signs and Body Language Cues
Developed from the research of anthropologists, archaeologists, biologists, linguists, psychiatrists, psychologists, semioticians and others.