Hypersmurf
Moderatarrrrh...
No. Very very debatable, even more than my previous comments... but by the rule that an AoO is a SINGLE melee attack, I would not allow the extra attack, just as I would not allow the use of Cleave.
By the same logic, you cannot use Cleave or Improved Trip without the Full Attack Action.
"Multiple Attacks: A character who can make more than one attack per round must use the full attack action (see Full-Round Actions, below) in order to get more than one attack."
Do you disallow Cleaves on a standard attack action or a charge? If not, why not?
-Hyp.