babies are obsessed by babies so both of mine loved looking at - babies!
www.amazon.co.uk/Hello-Baby-I-Love/dp/1405054239/ref=sr_1_5?ie=UTF8&s=books&qid=1219519980&sr=1-5
and 'peekaboo baby' which has big flaps which they could turn from an early age
www.amazon.co.uk/Baby-Loves-Peekaboo/dp/0756634865/ref=sr_1_3?ie=UTF8&s=books&qid=1219519664&sr=8-3
Gallop! is great too (adults also like it!)
www.amazon.co.uk/Gallop-Scanimation-Picture-Rufus-Seder/dp/0761147632/ref=sr_1_1?ie=UTF8&s=books&qid =1219519771&sr=1-1
and both of mine loved 'lets go to bed' - which is charming. good for when they're learning to talk - dd1 used to shout 'i'm ready'. illustrations are lovely.
www.amazon.co.uk/Lets-Go-Bed-Pamela-Venus/dp/1870516559/ref=sr_1_1?ie=UTF8&s=books&qid=1219519881&sr =1-1
in addition to lots mentioned above!
and if you want to be baaaaad there is a dvd called babies love babies which mine adore (still aged almost a year and coming up to three). it's not sophisticated (in any way). it's just babies doing baby things but the music isn't too annoying and they do love it! amazon only has second hand vhs i think we bought ours from 'babies love babies' website but out of time so will leave you with that thought.
www.amazon.co.uk/Babies-Love/dp/B0000A33RL/ref=sr_1_7?ie=UTF8&s=dvd&qid=1219520112&sr=1-7