Aaron asked about baby signing, and so I'll put a few links here in case anyone else stops by looking for information.
I don't know ASL (American Sign Language) YET, nor do I know anyone personally who speaks it. The signs that I know I've picked up from a few books and DVDs. We started learning them and using them with the girls long before we knew our daughter Elisabeth might have hearing and speech problems. Babies can make gestures and signs before they physically are able to pronounce understandable words, so teaching them to sign early lets you communicate with them before they are able to speak. The current thought is that it enhances their language ability and vocabulary (as we have definitely seen with Catherine), rather than detracting from it as some people fear. We started with teaching "more" (fingertips of two hands together) when we were spoon-feeding them very early on, and as soon as they could clap it became their sign for "more", and we just went from there.
The best resources we have used so far are:
Baby Signs, a book by Linda Acredolo, Susan Goodwyn, and Douglas Abrams. Gives a basic introduction and tips on how to start, as well as several pages of basic signs babies can learn first.
When I've had to look up a new sign, I've made a lot of use of the ASL browser by Michigan State University. A great resource.
The Signing Time DVDs. We have six of these so far, along with two of their music CDs, and some signing flash cards. Elisabeth ADORES these DVDs and asks for them by sign ALL THE FREAKIN' TIME. In the photo from this morning, that's one of them that Catherine is holding and another one playing on the TV. We played the music CDs on our vacation trip. They're happy, fun, educational, and I can't get the girls away from them.
Note: No, I don't drill my 2-year-old with signing flash cards! I put them in a little photo-album "book" for her own special little book, along with some photos of familiar things around the house, and she treasures it and carries it around. We use it for reading and naming and pointing practice. House or mouse?