Sorry it's taken me a while to get back to you, I bought the Sing and Sign DVD from their website - I also bought the vocab.book too which is fab!
The DVD is great, because you actually see the teacher showing us how to do the signs... the book is good, with lots of frequently used words, but seeing someone actually sign makes it much easier to remember. The Sing and Sign DVD is fun for the little ones to watch too, as the teacher sings silly songs to help the babies remember.
I'd highly recommend the DVD's, Tiny Talk (they have a website too) and Sing and Sign use a very easy version of British Sign Language - there is an American one (can't think of his name right now), but their signs are different.
My little boy loves the new DVD, as it shows a trip to the zoo, a little one learning to use the potty and Jessy Cat - who is a puppet (he is already signing 'cat' and 'where' - in only three days!! Good luck, it is so rewarding - you'll feel very pleased with yourself and your baby when they make that first sign.
Just a hint.... get your husband, their grandparents everyone involved as repetition is definitely the key. You will probably think that your baby isn't learning anything, as he/she won't sign for what seems like ages, but one day that little sign will come - and you'll be in tears!!!lol