I forgot to find that essay again. Opps.
Anyways, determinism has issues. As noted, quantum theory. However, is random dice being thrown any closer to "free will" than determinism? Sure, these tiny difference makes HUGE differences down the road, but still we aren't the ones making the choices. Its hardly "free" will. More like random will.
Similarily, it should be noted quantum mechanics can also be seen as deterministic.
Of course since it could easily be argued that since we are so far along in a chaotic system there is no way to tell the difference between the two, this is a bit of a silly question with no answer.