Use "secret" hand signals to have students SHOW you what they need. Each finger means something different, so the teacher can differentiate what kids need when there are 7 hands raised! Great classroom management technique for nonverbal communication.
Quiet critters: In times of quite needed, pass out quiet critters. Take away from those caught talking. At the end of the activity, anyone who still has a quiet critter gets a prize, point, or whatever system used.