We all agree that IEDs are an old method of waging guerrilla warfare.

If we reflect back to recent history, we'll also all agree that the Iraqi intelligence/military service had excellent IED making skills and other paramilitary skills, as demonstrated in numerous successful attacks overseas against selected expats and other targets. We also know the Lebanonese Hizbullah have long been masters in developing sophisticated IEDs, probably in large part due to training and assistance received by the Iranians and Syrians, who probably received their initial training from the USSR back in the day. It is probably a fair assessment to assume at least some of the foreign fighters coming into Iraq from Syria hail from Lebanon. None the less I wouldn't write off the possiblity, or even probability, that some states are also providing IED and other support to select insurgent groups. If we end up proving this, then we have a situation that we need to fix with appropriate response.

In the mid to long run the greatest danger is that their IED techniques, tactics, and procedures will migrate between the various terrorist/insurgent groups, and will eventually be exported elsewhere to support Jihad in say Indonesia or Nigeria. Anyone notice the rapid rise of IED attacks in Afghanistan lately?

I think the bottom line is we need to need to find, fix, and finish the IED facilitators wherever they are, and sooner rather than later. Everyday they survive, they improve their craft.