A video baby monitor in Texas was hacked via the Internet and abused by a very bad man:
If I connected security cameras at work to the Internet, authorities would come at me with full force. Surveillance is sensitive information and must be treated as such. One of the problems, then, is that most people are not trained to think of information security in their daily lives.
As a trained professional, I would look at the package saying "over the Internet", shake my head in disgust and put it back on the shelf - unless I was looking for a public web camera for Runde. Blinded by the convenience, however, a lot of people will cheer with joy for this invention, not realizing that they are opening themselves wide open to a malicious hacker ready to subvert their children.
The formula is fairly simple: Identify what is sensitive information (or sensitive access to your loud speaker as well, as in this case), identify who needs the information and the shortest route there, make sure you do everything you can to protect that channel in all nine aspects: Confidentiality, Integrity and Availability of Storage, Transit and Processing.
I will leave it for the reader as an exercise, before I reveal my own analysis of this system.