PeerGuardian 2 is an IP address blocker that can prevent access to thousands of sites. It uses multiple, categorized lists and you can choose which type of site(s) you want to block, including spyware/malware related, advertising related, P2P file sharing related and more. The lists are maintained and updated by a community and you can automatically have the program download the latests lists, and also create your own based on your personal blocking preference. PeerGuardian 2 keeps track of all blocked sites, and you can easily overwrite blocking rules or add new site directly from the log viewer.