Originally Posted by Master_Shake

http://www.bluedojo.com/papers/determinism2/ has some decent information on Paul Holbach's essay, "The Illusion of Free Will."

I have personally always responded to the causality rejection of free will.

Consider the action on a pool table. The blow of a cue stick on a billiard ball (event 1) causes the motion of the ball (event 2), which causes the ball to reach the pocket (event 3), where it falls into the netting (event 4). In this model, given the properties of the objects to be acted upon and a set of initial actions, the changes in the system that follow are a matter of actions and reactions, or in other words, a chain of events. To trace causes is to trace the chain. An event that cannot be traced back to preceding events is, in this view, an event without a cause.
Our observations of the world around us support this cause and effect process. Although it is often difficult to locate causes, and although their is rarely only one cause, every effect we observe has been caused by something preceeding it. To assume that our minds operate differently then the rest of our environment, even though our brains are made of the same physical matter as those things around us, is to assume that the mind is the singular object that does not conform to cause and effect. I personally, don't think we're that special.
Even accepting the chaos theory of cause and effect, that slight variations in initial conditions can lead to wildly divergent results, only affects our ability to predict. The fact that much of what we observe may be based on random processes that we are unable to predict does not equal free will.
Peace.