Personal Digital Footprint Calculator — You're bigger than you think

Check it out here.

FunFact: ".... all the ambient digital information about you — a person's 'digital shadow'... — now exceeds the digital information that you generate yourself by sending an e-mail, taking digital pictures, viewing a YouTube video, and so on.

"The digital shadow information includes credit-card trails of purchasing behavior, names on mailing lists, Web surfing histories, even surveillance images captured at airports, urban centers, traffic crossings."

[via Steve Lohr and the New York Times Bits blog]