addendum re the posters who expressed concern about amateurs just making pretty arm movements and the problems of amateurs signing inaccurately:

Because I am a rank amateur, I don't sign songs for others, I do it for myself, like singing in the shower. I am frustrated that I don't know the language better, and because I'm rather isolated I don't get much practice with people who know the language so, like with any language, it's hard to learn more, and to learn accurately - like ya'll said, reading the Joy of Signing just doesn't cut it. However, I am a linguist by training and it isn't just the pretty arm movements that attract me, it is the totatallity of ASL as a language - it is a beautiful language, and I think that as it does involve your whole body it is in a sense a more complete language than one that just uses the spoken word. For those unfamiliar with ASL, it is NOT signed English. It has a unique syntax and vocabulary and reflects a distinct world view just like Chinese, Russian, Spanish, English, and every language. And so, as one of the posters noted, you can't just substitute individual ASL signs word by word for the English anymore than you can Chinese. - I loved the "baby" example.