Accel World is by Reki Kawahara, same person who's responsible for Sword Art Online, both of which are popular and the same general sci-fi setting, both excellent animes. Anyone seen them?
Second thing, is they use something called "Brain-Computer Interface" which is also called a neural interface has gotten so advanced now the first convention is being held in San Francisco in May 1-2 of this year. If you want to know more about it you can read it here:
http://en.wikipedia.org/wiki/Brain%E2%80%93computer_interface
Honestly some of the stuff there is so crazy it's hard to believe. I wonder what other's think about it, and maybe virtual reality is a finally a foreseeable product in the future, however distant...unlike how it used to be where it was just a "what if" and "wouldn't that be cool?"
Honestly though Sword Art Online talks about some of the things that can go wrong, especially when a certain maniacal maniac decides to try and figure out how to control people's minds and soul through their brain. I suggest a nice chat about BCI and/or Reki Kawahara's stuff, because I need someone else to talk about it with. That makes me selfish. Bael is a selfish elf.