Another thing they tried was sending out e-mails with encrypted software that would track back and report to HP where that e-mail was forwarded. So, they'd send someone a vaguely alluring e-mail and see if it was sent off to someone in the media. This didn't work, or at least they think it didn't work, mainly because e-mails with the header "Please Forward: From Nigeria" don't work as well as they used to.
This comes after revelations that HP hired people to follow around various board members and reporters. They also planted false leaks, hired a Private Dick from Omaha, and used illegal means to get people's phone records.
But the craziest part of this story? Congress is investigating. Apparently things like data mining, eavesdropping, planting news reports, and all around bad behavior is illegal. Who knew?