The New (Digital) Terrorist Threat

I read this very interesting article in the International Herald Tribune today. It talks about how the terrorists involved with the Madrid bombing shared common email accounts and saved drafts to leave each other notes: "Intelligence officials have said in the past that terrorist groups were using the trick, which investigators call a 'virtual dead drop.' But few concrete examples have come to light, especially in an attack as extreme as the Madrid bombings, which killed 191 people." Tools designed for convenience should not aid in destruction, but there is no real way to track this sort of thing, which must be frustrating to techies everywhere, to say the least.