I find Vinge's original concept of the technological singularity to be much more interesting
than Kurzweil's accelerating-progress thing, which suffers from severe selection bias: had he
written that book in 1920, it would have been obvious that an avionics singularity was
approaching by, say, 1990. It didn't happen, because progress in single technological fields
follows S-shaped curves, not exponential ones.