Robert Frost's famous line "good fences make good neighbors" continues to gain supporters. In a 21st-century spin on Frost's axiom, executives at Silicon Valley software firm Opsware (formerly Loudcloud) are predicting that encryption will not just become far more pervasive on the Net than it is now, but will cause the Internet to go dark, in the sense that a lot of currently accessible information will become secure.

The rise of wireless networks is exposing all kinds of electronic trails, says Howes. In a study late last year, wireless gateway provider 2Wire found that 21 percent of home Wi-Fi users could see their neighbors' wireless networks.

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