With little notice or fanfare, the digital world is fundamentally changing. What was once an anonymous medium where anyone could be anyone
-- where, in the words of the famous New Yorker cartoon, nobody knows you're a dog -- is now a tool for soliciting and analyzing our personal data.
According to one Wall Street Journal study, the top 50 Internet sites, from CNN to Yahoo to MSN, install an average of 64 data-laden cookies and personal tracking beacons each. Search for a word like "depression" on Dictionary.com,