Tor Legal FAQ Discusses legal issues with running a onion routing node on the internet. Interesting.
Tor DMCA response template I think this may apply to P2P software too. I've been wanting to create my own P2P communication system, but with legalities being so hostile, I am hesitant. I should finish my website first anyway. ;-)
Chilling Effects site - about the chilling effects caused by abusers of copyright law and the DMCA.