Everyone has posted such great suggestions already. When I was in the hospital I didn't use most of what I packed, but was glad to know it was all there. My top picks:

Socks - the ones with treads on the bottom are nice since the floors can be well polished
Chapstick and lotion/moisturizer for yourself
Headband, scrunchie, hair clip
Your own SOFT toilet paper or premoistened wipes
A focus point - could be your teddy or a picture, to help during labor
A favorite blanket - I brought one from home for after the dust settles. I'm always cold and liked the idea of cuddling up with my new little one something from home. I stayed for two days.

Also, do NOT bring any jewelry or other valuables that you absoulutely don't need. I left all but my wedding band at home. I didn't want to risk losing anything or scratching my little one during those first few "graceful" days. I think I had everyon remove thier watches for a month before they held my son

Good luck and remember for the next few months you get a free pass to sleep anytime you're little one lets you no matter what time of day!!