This Youtube video is awesome. It is a documentary about prosthetic limbs and organs looking at how close we are to being able to build a futuristic cyborg like the ones we see in movies and video games.
Awhile ago I was talking to Hoop Girl about the future and we were discussing the possibility of uploading consciousness into a computer. I used the phrase 'leave the meat behind and go flying' and she looked at me with a funny expression and said that she thought that the meat could be a lot of fun. Can't argue with the fact that some parts of me that wouldn't be modelled by a consciousness upload do in fact provide lots of entertainment value! However, the appeal of massive processing power, memory and ludicrously fast communication (to say nothing of immortality) is immense. Right now we aren't even able to see consciousness uploading on the horizon but building more powerful bodies and organs than we get naturally is going to occur within my lifetime.
What will you do when you are faced with the choice of using a robotic arm that is stronger, faster and tougher than your 'real' one, especially when you can swap out your hands for other tools like swimming fins, chainsaws and who knows what else? I think there will be an awful lot of soul searching when our society is first faced with the real choice of becoming a cyborg not out of necessity (which plenty of people do right now) but rather out of a desire for an upgrade.