I have always been curious - why do so many people refer to terrorists living in "a cave in Afghanistan" to poo-poo the notion that terrorists are capable of doing anything that requires advanced logistics, co-ordination, or technical expertise? Osama Bin Laden may have been holed up in a cave in Afghanistan, but he was certainly not some technically incompetent troglodyte.

As for cyber-warfare/cyber-terrorism, it's been known for quite a while that both military organizations and terrorist groups are very interested in using the Internet, not just for communications, propaganda and recruiting, but for launching attacks on critical infrastructure.

Many computer security experts (not just Bruce Schneier, he's just the most vocal about it) believe that the 2003 North American blackout was caused by the Blaster worm, which they suspect an employee - either maliciously or carelessly - introduced into the system.

Aum Shinrikyo, the friendly Japanese cultists who brought you "Sarin on the Subway", make a special effort to recruit computer science and mathematics students into their ranks. The cult is known to own at least five computer companies. In 2000, it was discovered that "A female member of the AUM Shinrikyo cult was involved in the development of online systems at Kiyo Bank", where she "was believed to have had access to the names of clients, as well as data on their assets, annual incomes and transaction records".
(http://findarticles.com/p/articles/mi_m0XPQ/is_2000_March_6/ai_59998378)

Plans to implement a computer system developed for the Japanese national police authorities were delayed indefinitely after it was discovered some of the software had been developed by a subcontractor that was owned by Aum Shinrikyo.