I get asked all the time "why do programmers write viruses?" The recent Mac Defender took advantage of users, not the Mac operating system, to authenticate and do its damage. The mainstream media talks about viruses as disrupting users' access to their computers, or exploiting privacy and stealing data.
This piece is a quick overview of the Stuxnet computer virus, which was used to disable Iran’s controversial nuclear facility last year. The implications of an open source virus as a weapon are many. Are you ready to trust your data to the cloud? What's your disaster contingency plan?