We learned about these in my Sensation and Perception class. I think it's amazing that we can take what we've learned about the auditory system and use it to make a literally life-changing device like that. They must work quite well, too, because speech development in children that get them is pretty much even-paced with children using natural hearing ability. It's great that those who otherwise couldn't have the opportunity to hear voices and music CAN. What's wilder is that this has been around for a while, it's just that they only recently got so small.
What's sad, though, is that a lot of persons (not everyone, of course) in the Deaf community are wholly against these implants, saying that they are an insult to Deaf culture. And essentially that their culture will be eliminated because of these implants. I guess I can see where they're coming from, and it could seem like those implants are just a way of saying, "See, you weren't good enough as you were, we had to fix you..." But still.... to have the opportunity to experience more of life and say no? I don't think I could do that... But hey, maybe that's not the case anymore. As tech has improved, they may be more accepted now.
Man, those videos are great.