Check out this thought-provoking look at the evolution, immensity, and possibilites of the Internet, by Wired magazine. There are 5 pages and it's a very interesting read...
"This planet-sized computer is comparable in complexity to a human brain.
Both the brain and the Web have hundreds of billions of neurons (or Web pages).
Each biological neuron sprouts synaptic links to thousands of other neurons,
while each Web page branches into dozens of hyperlinks.
That adds up to a trillion "synapses" between the static pages on the Web.
The human brain has about 100 times that number -
but brains are not doubling in size every few years,...
...the Machine is."
(This unexplainable similarity on different scales is another example of our Fractal Reality.)