A couple of things...
Ranking Google relevance By Luther Blissett
"When the Google chariot has been everywhere and photographed everything, the terrorist opportunities will be instantly identifiable by the blanks."
They already reuse older data to protect potential targets, a few years ago I used a Google Earth image of the New layout at Bisley so the Scouts could find the New NSRA building, following year they'd reverted as Pirbright was too clearly shown to data 10 years out of date.
Obviously, By Steve Foster
"We need the photographic equivalent to the cycling event/group Critical Mass."
Yes, maybe, a comment I made on UK.REC.CYCLING was picked up by, and if the Police Inspector was telling the truth, forwarded to the Police by Google. The comment was about the standard of Police drivers driving when returning to an unassuming building on an industrial estate being used as an undercover base. It seems the cyclistas on uk.rec.cycling are concidered subversives and are targeted as such, much the same may happen to photographers rights groups.
Google is NOT your friend, the Governments friend, but not yours, IME.