Tom told me about this technique before I taught my first class, and I have yet to use it, but I like the sound of it.
Here's how it works.
1. Take a set of lecture notes, and split them into a series of questions that are sequential and anticipatory
2. Present the class with the questions in sequence. Everyone in class responds to the question in their notebooks and pair-shares.
3. Call on people to tell the group what their partner's response was, saying "X, what did Y say?" Then ask "Y, was that right?"
4. Write important points on the board, and add to them.
I guess you could call this "constructivist lecturing", since you help the students to construct knowledge about what's being discussed - though the teacher remains the ultimate arbiter of fact.