Baby Sign

To answer your question Jerin...
The book Evan was holding up in a previous post is an introductory book on how best to implement sign in your everyday interactions with baby. I got it for $8 @ Target. Its a pretty good book, but it should come with a preface that not all babies need to communicate with sign. I have a friend who's 10 month old boy already "talks" to her. He actually says words and probably doesn't need sign.
They recommend starting at 8 months, but not to expect seeing any reciprocation till 10 months or older. They really should emphasize 'older' cause it just made me frustrated and feel goofy for signing to a kid that doesn't seem to care. :)
I like this book because it emphasizes not just signing, but also speaking to your baby as you sign. That way he's learning both. My only concern was that Evan would get comfortable just signing and not attempt speaking. Right now, he doesn't actually speak words we'd understand, but I know what he's trying to say with the noises me makes and signs.
The book doesn't have as many sign examples as I'd like, but I guess I could just get a real sign language book for that. The funny thing is that Evan has made up his own signs and ways of communicating. And he's simplified signs for his own convenience. Like the sign for banana, the whole sign is one hand holds up an index finger, to represent the banana, and the other hand acts as if its peeling the banana. Evan just does the peeling part with his right hand. So, like baby talk is simplified speech, baby sign is simplified sign language!
What does Evan sign now? Food, drink, banana, thank you, claps when he's pleased with himself, pointing, Lucy to 'come', Lucy to 'stay', where & what, no no no don't touch, all done & all gone (eating), give, and pick him up.
Also, kids are pretty bright to figure out that handing you your keys or their shoes means they want to go out, or something like that, that isn't an official sign. Really the end point is that baby and parent have another way of communicating, other than crying and tantrums.