Pray tell - just how many sections did you find?
There's a lot about al-Qaeda's use of the internet in Imperial Hubris. An entire chapter and many other sections in the book. Both Scheuer and Richard Clarke, the Bush administration's former counter-terrorism coordinator (who also wrote a 'tell-all' book) clearly understood the key importance of the internet to facilitate Al-Qaeda's terror plans.
I disagree strongly with Scheuer's tactics. However, my opinion doesn't count and Scheuer was the head of the CIA's bin Laden unit.
I believe Al-Qaeda's cyber-security threat is vastly overrated as well as 'spy' uses such as steganography for covert communications. Terrorists want to be understood.
Terrorism is done out in the open. After the terrorist act occurs they usually claim credit over the net. A beheadding has very little impact unless it's broadcast to the world. People need to realize that Al-Qaeda uses the net for recruitment, propaganda, incitement, fundraising, extortion, intimidation, .... etc. right out in the open -- in plain English (or Arabic, French, Urdu, Malay...).
The sites are easily traced, the credit cards paying for the site are on file at the ISP as well as the IP address of the terrorists uploading content are in the server logs. So why keep the thousands of terror sites on line? If they're keeping the sites online so they can be 'monitored' -- then why doesn't the CIA monitor the sites? (Instead of writing 'tell-all' books) If some hypothetical Arabic translator in some cube in the bowels of Langley is actually translating the terrorist statements off those sites -- they why isn't it being published so the U.S. citizens paying for it can become aware of what's going on.