He actually did a TED talk two months ago at TED2015. It's from 4 years after the article above was written, and it's one of those talks that leaves you with lingering thoughts for days afterward.
Thanks for the link. Daniel Kish's story is inspiring.
I actually tried to do this as a sighted kid. I got good enough fairly quickly to find the doorway in a dark room. Which might not seem like much, but it more or less removed my fear of the dark which is probably a useful thing.