Does anyone know a good website to learn sign language?

Answer 1

It is hard to learn ASL from just a website or a book. What you need to try is to get out in to the deaf comminity and learn from the deaf themselfs. It helps than just reading form a book or watching something online. But still here are a few sights I use to brush up on my own skills.
www.aslpro.com
http://commtechlab.msu.edu/sites/aslweb/browser.htm

Answer 2

JW.org you can download free sign language videos.