To save you trawling through the site or other threads here is a list of things which you MAY want to include in your hospital bag. I appreciate that it's pretty long and you may need several suitcases to fit it all in so do remember that you don't have to take ALL of this stuff if you don't think you'll need it.....

As more suggestions come up I'll edit this initial list so that it's always easy to read/print off.
For You
Nightie for labouring (cheap and cheerful, likely to be blood/wee/poo/amniotic fluid covered - Matalan £3 night shirts are ideal)Nice Nighties (pref with buttons for feeding)
Dressing gownSlippersWarm socks (in case your feet get cold during labour)
1 or 2 x packs of Always Nightime (these are extra long pads)
1x pack of breastpads
2 x packs of disposable knickers (you either love 'em or hate 'em! but I liked to go to the loo, wash and chuck the knickers and pad in the bin)
12 x Normal knickers (if that's your preference)
Flannel (cold for cooling sweaty brows during labour or hot to lay over achey backs/tums )
Straws for drinking between contractions
Lip Balm Moisturiser
Shampoo
Conditioner
Body wash
Sponge/Body Mop/Flannel
ToothbrushToothpaste
RazorBrush/Comb
Make up (not essential but nice for pictures after birth

)Bobbles/clips/headbands
Flip Flops for showers (not essential)
Lansinoh Nipple cream (quite expensive at £10 per tube so maybe take your hubby to Boots and show him where it is in case you need any of it)
Magicool spray (godsend for Chilli!)
1 x Large Towel (dark colour for showering, may get blood on it)
1x Small Towel (for your hands/face/hair)
Plastic jug (to pour tepid water over yourself during or after every wee, keeps the area nice and clean, takes the sting out of weeing after a tear or graze)
Kitchen Roll (to pat yourself dry after washing yourself as above. easier, more hygenic and less messy than using a towel)
For Baby
Cotton Wool Pleat or large discs (balls are too small when wiping massive sticky poos)
Baby Bath/Wash (not essential, can make some babies spotty/rashy)
Talc (not essential, matter of choice)
6 x All in one suits
6 x VestsScratch mits (unless you have the sleepsuits with hands in from Matalan)
Cardi
Blanket
Pack Newborn Nappies Pack Nappy Sacks (not essential)
Baby Wipes (not essential, can give some babies spotty botties and encourage rashes)
Dummies (not essential)
Teddy (ahhhhh

)
Outfit to come home in
Hat to come home in
For DH/DP
Does DH know the way to hospital? If not entirely familiar then a map of the area in case of roadworks, diversions or other unforseen circumstances. Also handy if DH isn't the one taking you to the hospital in the end

.
Money (might as well get him used to being a Dad eh?

)
Magazine or bookWater/Juice/Pop
Something to eat that's not chocolate, a savoury snack to keep his energy levels up.
Mobile PhoneCamera
Ipod (to drown out your screams.... kidding!!!

)
A few toiletries if he's planning on staying for the long haul.
Clean tshirt/boxers/socksA list of your important numbers to phone after the birth.
Extras
Wet Wipes
Antibacterial Hand Gel
Antibac wipes (for loo seats)
Disposable Camera (just in case you leave your digi cam at home or your batteries conk)
NotepadPhone numbers
£5 in change
Pen
Crisps/carbo/salty snacks
Mars Bar
Polos
Boiled Sweets
Pack Tissues
Bottled Water
Announcement cards/stamps
Address Book
Magazine (no time to get into a book between contractions/feeds)
Salt and Pepper Sachets, Ketchup or anything you can't live without.
Carrier bags for dirty washing
Travel Clock
Mobile Phone
Phone Numbers
Bottles/Milk/Bibs if that's your chosen method.
Car seat at the ready