Remember SiFi movies and stories about the future: "the 21st century"? From god knows when (the oldest I can think of are Jules Verne's books) until just before year 2000 with movies like "End of Days" (released late 1999) writers and story tellers have published their visions of the 21st Century. In fact, it wasn't only the fiction tellers but also scientists like Vannevar Bush have published their detailed visions.
Now that we are five years in the 21st Century, don't you wonder what those theories were? Tales of Future Past is one of the good places to look!
BTW, and speaking of Jules Verne, did you know his books are available online in his website?