Guess I throw in my 2ç's worth. Some people argue that the measure of a human being's intelligence can be determined by the number or amount of activity of neurons in the brain. I don't necessarily subscribe to this thought, but it will help me make my point. A P4 cpu has around 180 million transistors while the average brain has about 20 billion neurons. It is conceivable then, imo, that as the amount of transistors on a chip comes closer to the amount of neurons in the brain, that computers may develope attributes simliar to human intelligence, or maybe even sentience.