Skype use may make eavesdropping passe: On Skype, no one knows you’re not a terrorist. The government should rightfully be freaked out.
[…] to a large extent, Internet users haven’t felt a need for privacy that outweighed the extra effort needed to use encryption. In particular, e-mail programs such as Pretty Good Privacy have been considered too cumbersome by many.
And because such applications have had limited popularity, their mere use can draw attention. With Skype, however, criminals, terrorists and other people who really want to keep their communications private are indistinguishable from those who just want to call their mothers.
If this interests you, you should read “Crypto” by Steven Levy. It’s the story of how the government was unable to contain simple encryption and how it got into the hands of the average Joe.