I've brushed up on it from You Tube and follow Nyle DiMarco on Twitter because he's a deaf advocate and for the reasons I stated above. Good luck on your lessons! It is a beautiful language and fun, too!
The first link is my main source of learning. The second guy is good too. Signing Savvy is a quick resource when I can't find how to spell something and the first link doesn't give me an answer.
http://www.lifeprint.com/
Signing Savvy | ASL Sign Language Video Dictionary