Electronics Standards Why Not? power/data/audio/video all in one

I am reminded of another annoyance, why do we have so many freaking cable cords and chargers laying around? It is time for a single charger and cable to be able to transmit data and power, what I mean by that is that my computer should have only one cord coming out of the back of it and that cord should be able to provide the computer for example with power/internet/phone line/audio and video, also I should have only one charger which can be used to power/charge my ipod/cell/tv/cordless phone/speakers/camcorders/PSP/Xbox/PS3/Video Monitor etc…, it is time for a standard in power/data/video/audio delivery. I must have in total over 50 chargers and over 100 cables in my closet from the devices I currently own or owned at one point, imagine all the material that would saved if we can design a single smart system that delivers power/data/video/audio to multiple devices with a single cable, I am not saying that all the devices would require the same amount of power however the device should be smart enough to determine what amount of power is required by the connected device and deliver that precise amount, also once said device is charged it should put itself on standby mode saving money and power.