think its mostly been covered. I took a banana and a yoghurt. not that you really feel like eating but if your there for hours or for after, it was a good idea. Food for DH!!
Drinks.
Pillows. i have a V pillow i used all the time through pregnancy and it was good during labour....also a bit of a comfort.
Different clothes to wear buring labour....chances are youl end up starkers but i didnt know what i wanted during, changed from loose top to tight one to nothing lol.
A shower cap.....sounds stupid, not that i cared what my hair looked like after id been in the shower during contractions but i guess it was one less think to worry about. and more comfortable not having wet hair/clothes.
Something for DH to wear in the shower.
Dh had to keep going out and getting more maternity pads! the hospital ones were crap and boy did i need them!!
other people have already said oils,music.

Think i had my bag packed about a month before too!! its reasuring though.