The author, Gabriel Weimann, says that all of the more than forty active terror groups, regardless of ideology, have established their presence on the internet.
He says "websites suddenly emerge, frequently modify their formats, and then swiftly disappear -- or, in many cases, seem to disappear by changing their online address but retaining much the same content."
The Alneda.com website is a perfect example of this process, but many other al Qaeda websites have gone through similar migration patterns. One, www.jihadunspun.net , which is designed primarily to show video from al Qaeda sources, remains live but appears dormant, activating only when it has new content to broadcast. Dozens of other al Qaeda websites, many revealed publicly by amateur sleuths, have simply evaporated in the wake of September 11 and the onset of stepped-up scrutiny by both enforcement agencies and hackers.
Another, www.conrado.net/_vit_inf/ , named by the SITE Institute as the "official" new home of al Qaeda online, has only recently vanished, along with www.waaqiah.com , the English-language website most closely associated with al Qaeda. Waaqiah replaced Azzam.com, which held that mission until being shut down more than a year ago.
What terrorists do with their websites
Weimann says "terrorist websites target three different audiences: current and potential supporters; international public opinion; and enemy publics" and are used for the dissemination of propaganda in service to recruitment efforts, fund-raising and activity coordination, among other purposes.
High on that list is an active psychological warfare element designed to sap the will of enemy populations, he says, and terrorist websites are notorious for collections of horrific videos and photographs.
Interestingly, all tracking agencies agree that photographs on terror sites are sometimes really envelopes for secret messages to clued-up agents in the field. The use of steganography -- hiding coded messages inside images -- is widespread on terror sites because it is almost impossible to detect and cannot be decoded except by the intended reader.
Steganographic encoding isn't limited to pictures, though -- it can even appear as text in email that seems to be mere spam or an otherwise unobjectionable message.
Spammimic.com , for example, will turn any message into another that in which the original is undetectable -- until it is run through the (secure) decoding tool the site provides. Properly constructed, a website's apparently innocent exhortation from the Koran could, for example, contain precise attack instructions for agents in the field.
What's next
Squashing the websites of terror does serve a purpose, but many experts say they are better left alone and monitored.
That can provide insight not only into the whys of terrorism, but the hows.
One expert, Paul Eedle, recently told an ABC Network Lateline audience that, " Australia is consistently mentioned by Al Qaeda leaders, from Osama bin Laden on down, as in the frontline of its targets."
He said the Global Islamic media email list, considered to be a genuine source of al Qaeda pronouncements, was circulating not only long political tracts from its headquarters in Saudi Arabia, but also weapons and operations manuals.
"They have to replace their physical bases in Afghanistan somehow and so long as there is a small number of highly trained people to lead groups, then these detailed manuals of writing how to write recipes for explosives are all crucial," he told ABC News.