i have come across an issue where alot of the blocklists i use block the companies that make many games such as valve or ea servers rendering these unplayable. i think peerblock could do with a application whitelist. basically adding a .exe file to the list would exempt it from peerblock screenings allowing non P2P applications to run without interfearance from a poorly constructed block list. it sure beats the alternative of searching through all the lists and manually allowing everything