There was a company some time ago that came up with a peer-to-peer device that connected to public hotspots, then anonymized throughput. It was yanked off the market very quickly, and the suspicion in many circles is that it got a national security letter. That offends me, as privacy and anonymity are fundamental human rights. But can’t remember the name.
It’s worth noting too that even secure systems can be bad news. I had a Hushmail account some time ago and did absolutely nothing illegal or unethical about it. But I was in civil litigation, and the other side lied to a Canadian judge and got access. Everything but the subject line was encrypted, but it was a shared account used by dozens of members of my family as a discussion board, so some of the stuff — like details of my Mom’s terminal illness — or blind personal ads on some of the account aliases — were not really for public consumption. And even though Hushmail encrypts everything, they capture so much metadata, including referrer, geolocation, and more, that any notion of privacy is pretty much shot.