Cell phone and Charger. That way, even if you forget your camera you will have some little pictures of your first meeting with your baby
The "grown-up" stuff: Insurance cards, ID, and a small amount of cash. After all, you are in charge of a tiny little person now! No time like the present to be responsible!!
A comfy, albeit large, pair of pajamas or an outfit and a few extra pair of underwear. No points for fashion, here, ladies!