There is one in particular I thought I should mention--the position position that believes that non-determinism in quantum mechanics somehow saves the notion of free will.
I'm not sure QM saves free-will, but because it shows that the initial conditions are non-existant rather than definable to the infinite decimal I think it may show that nature's chosen path cannot be determined -- at least with infinitely precise physical models as was believed in the past. At the beginning of every causal chain is an uncertainty where probability or nature or God rather than a previous cause determines what will happen next.
I don't know if science can fully explain free-will. I think this will become a very important question in the next 20 years as new computing technology allows intelligence in manmade devices to possibly exceed our own. We may be able to watch the evolution of this thing called free-will right before our eyes.
Subjectively I cannot convince myself that I do not have free-will. I can look at my palm and open and close my hand whenever and however I wish, and I can even choose to search for truth. But from a purely scientific point of view I can't see that there is any room for free-will (unless there is some undiscovered component of our brains e.g. quantum computation that relies on undetermined factors which we may metaphysically determine).
I think free-will like most everything else in the universe (time, space, matter, energy, probability, etc...) is a perfect illusion, a hint at something greater, and the birthplace of the human spirit.
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