This evening I was reading an article at Cracked.com: 7 People From Around the World With Real Mutant Superpowers. At #6 they mention Ben Underwood; he's been blind since he was 3, but he can get around by echolocation. Basically, he does the same thing as Daredevil - he builds up a picture of his surroundings by listening very carefully to echoes.
Admittedly, Cracked isn't the most reputable source, but there's also a Guardian article about Ben, and an amazing video:
In the mini-series "Daredevil: The Man Without Fear" (Frank Miller's version of the origin story), there's a scene where Stick first trains young Matt Murdock to deal with his blindness. "The air's filling the room. One wall's closer than the other. Feel it. Now the other wall. Feel it. Concentrate. Concentrate." When I read that, I thought it was pretty cool, and I could suspend my disbelief, but this sheds a whole new light on it. To a lesser extent, the same applies to Alicia Masters (blind sculptor), who creates very lifelike statues.
Coming back to reality, the stuff that Ben Underwood does is just ridiculously impressive; if he can take things in stride, it makes me look pretty pathetic if I whine about smaller setbacks. In particular, he's far better at inline skating than I am. The last time I tried that was in July 2003, but I've been meaning to try it again, so I'm planning to do Monday evening lessons in Hyde Park with Citiskate. Time to push my limits a bit, I think.