Since there are no perfect people, it follows there are no perfect parent(s) either. I think we all try to pass along to our kids the good things our parents gave to us. I also think we try to put an end to certain other generational things that aren't so positive.
For me, I was determined not to criticize my son the way my father criticized me. I remember a conversation I had with his 4th grade teacher (she had also been his 3rd grade teacher). I was explaining my childhood and my goal of instilling in my son a healthy self-esteem. She told me, "Oh you don't have to worry about that. You have succeeded." It was said with just enough sarcasm to convey the feeling she thought I had 0verdone it. That's okay - better to err on the side of too much instead of not enough.
What do you do differently than your parents did? What one thing were/are you determined to change to make a better life for your child or children?