This piece on the NYT bit blog really made me think.
Hackers and security researchers are moving away from simply trying to break into — or protect — people’s e-mail accounts, stealing credit cards and other dirty digital deeds. Now they’re exploring vulnerabilities to break through the high-tech security of homes, cause car accidents or in some extreme cases, kill people who use implanted medical devices….Yes, in the future, you will need to download security updates for your toilet.