This question always amuses me. How can a hypothesis for this ever be tested? Free Will or "The illusion of free will"? It doesnt really matter either way, since no-one really has a hold on what is going to happen, or what MAY happen (depending entirely on your beliefs on this particular subject).
I mean, I decide that I'm going to post a reply to this. I believe I made the decision to do so, and that the choice to either reply, or not to reply was entirely in my hands.....prove me wrong!! :) but at the same time, the argument stands, that maybe at this exact point in time, all of the events leading up to my posting on this bbs were predetermined, and that all subsequent interactions are also going to happen exactly as "its planned out"...I mean, maybe It was my destiny!?
HG Wells "the time machine" has all of this as a theme. So people have been pondering this question for quite some time!
So, to conclude, I don't lean either way, as no empirical evidence exists to prove one or the other. To the average person, it really makes no difference as we have no direct control over the flow of time or what direction that time flows.
I just go with the flow...seems to work out pretty well for me at least!
Peace!
PS Check my tunes!!! :):)