The National Terror Alert Response Center has an excellent article
Al Qaeda may be turning its destructive attention to cyber-warfare against the United States. In a chilling video, an al Qaeda operative calls for “electronic jihad” against the United States, and compares vulnerabilities in vital American computer networks to the flaws in aviation security before the 9/11 attack. Cyber Terrorism – Al Qaeda Video Calls for Electronic Jihad
Also see the ABC article on the above link.
Always take steps to protect your network and information regardless if you are an individual, business or government entity.