Great thread - DH and I argue about these kinds of decisions all the time (thankfully we have a little under 13 years to agree! )

Dye hair If she has the same kind of hair I did - nope. I have natural highlights and I will encourage her to appreciate that. If she really wants it coloured - when she can afford to pay it herself and has it done by a pro.
Shave body Yup - like one of the other posters said - I can't imagine being the only girl with hairy legs/armpits. I will encourage waxing as opposed to shaving.
Piercings DH and I have MASSIVE arguments about this one. We have agreed that if/when she asks to have them done, we will take her to get it done (if she is over 6). Other piercings will be discussed at the time. My sister has an eyebrow ring which looks very nice (makes her look more feminine believe it or not).
Swear Well, if DH doesn't can his swearing I won't be able to do much about this one...
drink Working in the field of alochol and other drugs, I look at this from a slightly different perspective. I will educate my daughter (and any other children I have) about the potential dangers and risks of consuming alcohol (and other substances). I will encourage them to not drink until the age of 18 (and will also educate them about safe drinking behaviours and "harm minimisation" to try and ensure "safe" drinking). If she is adamant she wants to drink before 18 - it will be only in the presence of DH or I so we can monitor how much and her safety. I have no hesitation in taking her to the hospital to have her stomach pumped. I hope common sense will prevail with her and she will not give in to peer pressure.
smoke Over my dead body... and her fathers. We hate this habit. However, we will use the same methods and tactics as with drinking. Education. Once she is 18, we can't really stop her so we will endeavour to give her the tools to make the right decisions and hope she uses them in the right way (and NOT SMOKE!!!)
go out at night This will depend on her age, her friends, society at the time. Most likely, in her early teens, she will be restricted to sleep overs at friend's and only when parents (that we know and trust) are present. When she is older, we will let her go out if she is dropped off and picked up by DH or myself (or someone we know and trust). In her senior years of high school she can go out on a Fri OR a Sat night so long as we know exactly where she is and what she is doing... and is home by curfew. Once she is 18 she can do pretty much as she likes within reason.

Getting in the car with friends I've cleaned up too many car accidents where teens have been driving (and also lost a couple of friends due to car accidents) to let her get in the car with anyone wily nilly. So long as I know the friend and have been in the car with them to witness their driving (on more than one occassion) - not a problem. BUT, not late at night/early in the morning and NOT if anyone has been drinking/taking drugs. Even if the driver is sober, they could sucumb to peer pressure of their intoxicated friends. I would also be looking at the kind of car - can the driver safely manage the car? I would much rather have a phone call from DD at 2am to come and pick her up from a party than a knock at the door at 2am to find the police standing there to tell me she has been in an accident. And I certaintly don't want to answer my pager to be called to an accident which involves my daughter...