I just came across this interesting story. I do remember that as X-Files was winding up, a spin off series, the Lone Gunmen, was piloted. I think it was shown over here on Sky One, but I never got to see it. It was based on the three geek-types fron the X-Files.
Curiously the pilot episode was a little predictive – in the pilot episode a plane is hijacked by remote control and flown towards…you guessed it, the World Trade Center. Not only that, but according to the plot, shady figures in the US government organised and directed the attack, and after blaming it on terrorists, would hope to get a larger military budget, and perhaps fulfill some foreign policy ambitions.