I thought it would be usefule to collect the ultimate list of stuff to take to a Music Festival. Anyway here is my first try.
Your tickets
If you wear glasses, try and pack a second pair
Plenty of loo roll and wet wipes (in 2007 the festival is giving everyone a free loo roll)
Wellies - if it rains, the welly stalls sell out in five minutes
Lots of plastic bags - pack everything in them; they keep it all dry
Bin liners are great too: useful to sit on - and they fit in your pocket!
A lightweight waterproof coat and hat
Combats make great festie trousers - lots of zippable pockets
Paracetamol/aspirin for the mornings after
Your mobile - make sure it's charged up and keep it with you all the time. You could get a disposable phone charger before you go
Sunglasses, sun hat and plenty of sun cream (just in case!)
Thick jumper - even summer nights get cold
Loose clothing
Torch, plus batteries
Tin opener
Sleeping bag
Vital medication
Tent (if you're sharing a tent and you're carrying parts of it separately, make sure you all know who's responsible for bringing what before you set off!)
Soap/baby wipes - no-one likes sharing a tent with someone who smells
Chocolate - if your money runs out, something with high amount of sugar will keep your energy up for the long trek back home
If you wear glasses, try and pack a second pair. They're a common casualty in an excited crowd
Bring all your drinks in plastic bottles - glass is not allowed on sites
