> To that I would say, one should be very very very paranoid about what you print, given that you know that you're printing things from people's credit card bill statement.
...to a point.
What other 'bad information' might be in that description? Social Security # for a USA customer? Social Insurance # for a Canadian customer? Pretty soon you'll have a laundry list of 'bad numbers' that you have to try and filter out.
To that I would say, one should be very very very paranoid about what you print, given that you know that you're printing things from people's credit card bill statement.
Blippy shouldn't have output'd the cc numbers, whether or not Google caches it or not is a secondary to this. Note that Google's cache wasn't explicitly out to get Blippy, they just happened to cache whatever Blippy was emitting.