And, no sooner had I posted the bit below, came this...
MADRID - A London-based Arabic newspaper says it received an e-mail from an al-Qaeda-linked group Thursday claiming responsibility for the series of deadly bombs that ripped across a Madrid train line, killing at least 190 people.
The newspaper Al-Quds al-Arabi said the Brigade of Abu Hafs al-Masri claimed its "death squad" had penetrated "one of the pillars of the crusade alliance, Spain."
Still not proof, but interesting nonetheless. The finger of grim accusation seems to be swinging away from the ETA, and towards Bin Laden and his fellow troglodytes.