A quick comment, somewhat in reply to geocacher and also in encouragement for this thread.
Our local public elementary schools use "Smart" boards. They're essential the a commercial implementation of this threads topic. From a technology point of view the boards are unimpressive. The use model is identical to the mouse. The hands of the board user, are just mapped to the mouse input. For the most part the teachers merely launch powerpoint in presentation mode and just push a next/previous button on the screen. Not very high-tech.
The teachers, however, love these things because these boards have magically increased retention rates and overall learning. Anything taught using the smart board draws more attention, and is learned more intently. The students come home and actively talk about what happened on the smart board. You have to pry information out of them for anything that didn't occur on the smart board. I suspect one aspect of this improvement to learning is due to the additional senses used to comprehend the subject.
I fear the potential negative factors these could introduce. From my experience with the local public schools, however, I am inclined to say that this technology is worth pursuing. With the new curriculum and delivery models in the ward buildings, an interactive whiteboard is a logical progression. And even thought I'm not crazy about the idea of having electronics in the classrooms, it seems to be working very well for the California public education system.
I think perhaps it's time for us to develop maturity in the use of the electronic products. We now have wifi in our ward building, and can stream mormonchannel videos for use in the class. This is a very useful teaching tool. But after streaming the channel, the kids are inclined to want to continue using the phone for play. They're easily distracted by electronics. If, instead of shunning electronics in the meeting house, we integrate them so much that they become common place; then perhaps their ability to distract will become diminished. If we teach them to use the electronics appropriately, then perhaps the ultimate teacher, the spirit, can still be felt.
They've been using this technology in the public lower and middle elementary classes now for 3 or 4 years and so far, it seems to be working very well. I therefore encourage those technical contributors in this post to pursue further.