Pinterest has some great ideas:)
Lip balm, a pillow, shower shoes, outfit for baby to wear home, list of people to call or text, birth plan, correct spelling of baby's name, shampoo and body wash that you like. Just adding to the things already mentioned. Don't forget to make sure the carseat is installed properly before you go.
Don't forget the slippers! I also packed an exercise ball, some hard candy, an outfit to go home in (I was advised maternity clothes that fit when you were six months pregnant) nursing bras, nursing pads, glasses and contact lenses if you wear them, and maybe books or magazines, and definitely a cell phone charger. My lamaze class gave us a check off list and I found it helpful, you could get on online too.
Pajamas, robe, make up, pump, baby clothes, baby blanket, baby hat, wash clothes, toothpaste, heavy maxi pads, diapers, and a camera.