What systems do you have in place for your kids. Here one I have used with some success in our kindergarten-first grade room:
We issue three arm bracelets to each kid at the beginning of class. They lose a bracelet for talking when they shouldn't, not keeping their hands to themselves, or ignoring a leader.
They get a small piece of candy at the end of class for each bracelet they have left.
We tried to keep it very very simple and we framed it as a reward, not a punishment. Over the course of a couple of months, we saw great improvement in the kids' behavior as a whole - especially kids who are "followers" and are just mimicking the behavior of other kids. It also has given us a great way to talk about mercy and grace with those kids who have lost all their bracelets.
What system(s) do you use?