A kindie-cam. I would totally have it open on my browser all day long. I could check in on Helen any time I wanted, plus I'd finally have an answer when I ask "what'd you do at school today?" besides a glowering "I don't want to TELL you."
Okay, fine, I'd also like a fourth-grade cam.
Although the potential for abuse would be high. For example: "I noticed you were poking around in your desk when your teacher was trying to explain fractions to the class today. What's up with that?" or "I saw that you laughed when K made that mean comment about your classmate. How do you think that made him feel?"