I read an article called
Privacy in the Age of Persistence by
Bruce Schneier today about privacy in a world where everything you say and do is recorded for posterity. The
Slashdot posting about it also contains some interesting comments lower down, about people complaining about UseNET posts still hauting them a decade later.
The scariest line for me was this:
Cardinal Richelieu famously said: "If one would give me six lines written by the hand of the most honest man, I would find something in them to have him hanged."
But read the whole article. It is really interesting.