The technology has been around since the early years of the space program, but only recently has a car company released its plans to make a fuel cell car available to the general public. While Toyota's Mirai is a little out of my price range, I can't help but get excited at the idea. Rather than try and explain it myself, I have provided a link to Toyota's information here.
I also like that they are opening their patents to other entrepreneurs so that the technology can progress even further. We are living in the future.