What if, instead of filtering out copyrighted material, they used an IPS to filter out exploits instead? Are the civil liberties issues the same when the same sort of filtering is done but in a way that helps, rather than hurts, the user whose traffic is subject to the filtering?

It might be a good service for ISPs to offer. The only issues I'd have would be could I opt-out and/or see reports of what the ISP is blocking?

RE: Why does AT&T want to know what you're downloading? - By Tim Wu - Slate Magazine