Privacy, privacy, privacy. Be it tracking people online to using data-mining, there are so many blurry lines between what is useful to provide a good user experience, gather useful information, and ensure security and what is infringing on a person's privacy.
Personal use of government-issued technology. If you have a work Blackberry, do you really only use it for work? Let's be honest, it's inconvenient to carry around 2 devices and try to keep them straight.