Terrorist Web sites serve not only to spread propaganda but also to share knowledge among insurgent groups... That helps explain why the learning cycles among Iraqi insurgents are some 20 times as fast as the Irish Republican Army's were in Northern Ireland in the 1980s, according to military estimates.Worth the read. Robert also has a blog on software deployment failures called "the risk factor."
Also, if you can read french, Joseph Henrotin has an article entitled "L’open source warfare comme menace stratégique? Entretien avec John Robb, analyste des systèmes" in this month's DSI (Defense & Securite internationale). Sorry, can only find it in print.