In the 47 years I have spent on this rock, I have yet to see a futurist reliably predict the future.
If you mean successfully predicted a technology, social movement, or political change, then many Science Fiction authors fit the bill.
French author Jules Verne (often called the father of Science Fiction), for instance, predicted Cell Phones, the Nuclear Submarine, that _America_ would land on the Moon, the return splashdown (with a spookily accurate estimation of the total cost), correctly predicted the number of Astronauts that were sent, and seems to describe WEIGHTLESSNESS, writing that the astronaut's "...feet no longer clung to the floor". All 100+ years before the fact(s).
In 1898 Mark Twain predicted the World Wide Web (Internet), streaming video, Social Networking sites, blogs and discussion boards, all based on the phone system. Only a handful of years after the invention of the Telephone it'self.
H.G. Wells not only predicted the Atomic Bomb, but he coined the term "Atomic Bomb". He also predicted mutations as a danger from overexposure to uranium.
Even Gene Roddenberry predicted flip phones. (Can someone both predict and inspire the same thing?)
I'd say that SciFi authors, with some very specific predictions, have a better track record than Nostradamus and his ilk with their sweeping predictions.
Now if you mean someone who can tell you in detail what's the world will be like in 50 or a 100 years, you tell me, who does that?
Where the fuck is my flying car?
And you won't be getting a flying car until it can reliably fly itself, need no user maintenance, and not require a thorough going-over every other time you take it out. Oh, and can crash anywhere without endangering hundreds of lives. Until then it's called a helicopter, get a license and find places that have helipads and your golden.
Or, you could always look here: http://www.terrafugia.com/ Video: http://www.terrafugia.com/news/first-public-transition%C2%AE-demonstrations
Personally I suspect the flying car is going to catch-on like those Dick Tracy communicator watches http://en.wikipedia.org/wiki/File:Dt2wrr.jpg did. It'll just be more trouble than it's worth, and it's job will be done better by something else.