An interesting read here:
http://news.bbc.co.uk/1/hi/world/middle_east/5 375064.stm
Essentially, new classified US intelligence paper leaked to the New York Times (not exactly a radical newspaper), collates the views of the 16 major intelligence services in the USA in what is called a National Intelligence Estimate.
It blames the Iraq war increasing the threat of terrorism and fueling worldwide Islamic radicalism. The invasion and occupation of Iraq has spawned a new generation of Islamic radicalism that has spread across the globe. It reportedly concludes that, while al-Qaeda may have been weakened since the 9/11, the radical Islamic movement worldwide has strengthened with the formation of new groups and cells who are inspired by Osama Bin Laden, but not under his direct control.
(The White House is rather predictably attempting to play down the importance of this document.)
Of course, it's a little ironic if Bin Laden was the centre of a cult of personality, since the whole idea of al Qaeda is that it is a set of instructions to follow. It is not intended to be hierarchical or particularly have leaders and nor is it a system of organisation as such. This was problematic for the US, since their legal system can only prosecute for terrorism within an organisational structure. Outside of an organisation, the same acts can only be prosecute as Criminal Acts, so it has been very important to reinforce the view of Al Qaeda as an organisation, something it has never been or intended to be.