freedom wears (or surfs) black

"I worry about my child and the Internet all the time, even though she's too young to have logged on yet. Here's what I worry about. I worry that 10 or 15 years from now, she will come to me and say 'Daddy, where were you when they took freedom of the press away from the Internet?'"--Mike Godwin, Electronic Frontier Foundation

Freenet is an attempt to make a scalable darknet implementation. From the what is freenet pages:

"Freenet is free software which lets you publish and obtain information on the Internet without fear of censorship. To achieve this freedom, the network is entirely decentralized and publishers and consumers of information are anonymous. Without anonymity there can never be true freedom of speech, and without decentralization the network will be vulnerable to attack."

For more detail, there is also a philosophy page for the project.