<A target="_blank" href="http://voices.washingtonpost.com/securityfix/2009/05/zeustracker_and_the_nuclear_op.html">The "nuclear option"</A>, telling an infected PC to destroy itself, has been around for some time. Most cyber-criminals don't use it because they want the infected machine working for them. Recently someone triggered the ZeusTracker system to "kill" over 100,000 machines.