Here is a simple guideline, feel free to add to it if you have experience with this!
Your hospital bag:
A going-home outfit for you.
Several pairs of comfy socks.
Several pairs of underwear.
A nursing bra, if applicable.
A couple of comfy cotton nightgowns—made for nursing if you're planning to breast-feed.
A going-home outfit for your baby.
Your focal-point item, if you're planning to use Lamaze breathing during labor.
Super-jumbo maxi pads.
A stretchy headband.
A tennis ball.
A phone card or cell phone and a list of friends and family to call with the joyous news.
A camera and 2 rolls of film.
A video camera, 2 charged batteries (in case one fails), and 2 videotapes.
A small cooler packed with a sandwich and other snacks.
A comfortable pillow in an old pillowcase.
You don't need your own gown. A robe, maybe. And you really don't use most of the stuff on that list. Just stuff like shampoo and toothpaste, the baby's homecoming outfit and of course the car seat. If you are being induced you'll want a magazine or book or a gameboy and some good company!
i would take your own wipes. well i don't know about a hospital where you are, but all they provide at the hospital where i delivered my first two were these dry dryer type sheet things that you were to run warm water over. i can do that with a sturdy diaper wipe. so will be taking those for sure this time! and i would take a comfy gown, one you don't mind getting a little blood on though possibly. the hospital gowns suck!