ASL Browser
Online American Sign Language (ASL) browser where you can look up video of thousands of ASL signs and learn interesting things about them. You'll need the Quicktime plug-in!
Signing Savvy
Even cooler than the ASL Browser! Video of thousands of signs along with some additional features when you register. Registration is free. There is a membership feature with additional features for a fee.
The Deaf Resource Library
Online collection of reference materials and links intended to educate and inform people about Deaf cultures in Japan and the United States; as well as deaf and hard of hearing related topics.
Described and Captioned Media Program
This service from the U.S. Department of Education has over 4,000 educational and general-interest open-captioned titles available for loan.