This wasn't particularly about privacy, but I'm giving myself a bit of license at the moment, and the following points up the importance of the proper management of any database that contains personal information.
This report appeared in Saturday's Washington Post:
'The Army said it will apologise to the families of about 275 officers killed or wounded in action who were mistakenly sent letters urging them to return to active duty.
The letters were sent a few days after Christmas to more than 5100 Army officers who had recently left the service. Included were letters to about 75 officers killed and about 200 wounded"