Have totally agreed with Cailin all the way through here.
I am lucky in some respects in that all 3 of my DC are, on the whole well behaved. We have conversations on their level as to what I expect. If their behaviour is not as it should be then they would get a warning with a natural consequence, eg, if you don't get dressed and ready then we will not be going to the cinema at the weekend for example.
DS1 in particular does not react well to any negatives or punishments-this makes him more defiant. We have had to work hard at this, and read some positive parenting books and use the techniques there. Lots of praise, stars etc, and truly the difference in him was amazing in a short space of time.
I really would never hit my children. My mother hit me, not beaten but regularly "smacked". Terrified me. Was always scared of her. I would hate for my DC to think of me that way. I want them to know I would always be there, and they would trust in that. I never did with my mother-and that's enough for me.
I have used the thinking corner, as they have got old enough, by asking them to think about there behaviour. Have taken myself off to it at times too to think if I am getting cross too :o