Seth G. Jones is a political scientist at the RAND Corporation specializing in counterinsurgency and counterterrorism, with a particular focus on Afghanistan, Pakistan, and al Qa'ida... (wikipedia)
I think there is absolutely no question that the partial evidence strongly suggests that there have been increasing contacts between Afghan insurgents and Iraqi insurgents either in Iraq itself or in Pakistan, the trails going in both directions.
It's the smaller stuff - the winning hearts and minds - that's really critical, not big weapons and fighter jets to drop bombs.
There was a sense that there was nothing to learn from Somalia or Haiti or Bosnia.
The easier part was rewriting the doctrine. The difficult part of this will be actually doing it.