Big t shirt/nightie that you don't mind throwing away after.
Front fastening decentish nightie for afterwards when visitors with cameras come.
Camera (charged/with film)
knickers that you don't mind chucking out.
Maternity pads (sanitary towels in mega format)
Old towel.
Slippers (again you may never want them again)
Clothes to wear home. Still maternity ones I'm afraid.
Newborn size nappies.
couple of outfits for baby- vest babygro hat mitts. Cardi and blanket for going home.
Muslin squares.
Cotton wool.(sometimes hospital give you that)
List of people for your DH to call/text in order. Also what to say if he needs prompting (BIL asked me what to text to people..)
Your notes.
Other stuff could be sweets for you, ipod, an easy to read book/magazine.
Taken ages for me to type so someone else probably given you better list by now!
Good luck