Shel that list is good!
I will second the sleeping bag but personally from when they move into a cot upwards (till they're old enough to get themselves out of it like my youngest did)! lol They're a godsend when you are worried about it being colder at night etc.
For the hospital bag I would add a 'spray' of water from boots that is by Evian or something similar - got to buy mine yet, I had one with Erin and it was BLISS as was perm cold and refreshing on the tongue, face, neck etc when in labour.
Also, DEFINATELY get disposable knickers and lots of pads.. sadly things take a while to go back to 'normal' and the bleeding is err rather messy shall we say. DH pulled a funny face when I bought some the other day - I just laughed at him and said 'you DON'T want to know..' he got the point! lol
Also in hospital bag, pack snacks for yourself that will keep, and drinks - just in case. I had Erin at 8.30pm and first food I had from 4am that day was a slige of toast at around 11pm it was disgusting as made by the MW who was trying her best, but kitchen was closed etc, and water was the only refreshment. DH made me green with envy the next day as he hit 24hr McD's on the way home and opened a bottle of champagne!!
Change for the phone unless you are allowed your mobiles (10 years since I gave birth in hospital).
And those little ear plugs - to cut out the general noise not your baby - I slept with Erin on my bed most of the time but I use the term 'slept' loosely as the wards are noisy day and night.
Cotton wool for bums with warm water at first to deal with meconium and then reusable wipes or disposable wipes whichever you prefer.
Err.. oh and personal hate.. talcum powder, not only am I allergic to it, but it's a major risk to babies if 'puffs' in the air and they breath it in.. clogs up airway etc.
Hope my rambling helps! lol