Did you see his article "Memo to Bin Laden"?
http://www.ijtihad.org/BinladenII.htm "Once the war is declared, make no mistake Mr. Saddam Hussain and Mr. Bin Laden, We are with America. We will fight with America and we will fight for America.
I conclude by calling upon you Mr. Bin Laden and your Al Qaeda colleagues and Mr. Saddam Hussain to surrender to International Courts and take responsibility for your actions and protect thousands of other innocent Muslims from becoming the victims of the wars you bring upon them. "
I read somewhere that Khan is a Muslim from India, which would explain that he is not an extremist, like many Arab Muslims. That is why I tend to believe that he really is a more moderate Muslim, rather than someone who was more extreme and just pretending to be moderate.
But his writings lately have become more anti-American. Maybe the anti-Americanism of liberals at the Brookings Institute is rubbing off on him...