Peerblock is a piece of software which lets you control who your computer communicates with on the Internet. By utilizing lists of ‘known bad’ computers, it’s possible for it to block P2P companies from monitoring a user’s file-sharing activities, along with spyware and other malicious software. Just over a month has passed since the first stable public release of the software and PeerBlock has now managed to clock up more than 100,000 downloads.

See original here: 
PeerBlock File-Sharing Safety Tool Clocks 100,000 Downloads