I will add in my .02 cents, here. I just finished Robert Wright's Moral Animal (recommended). His conclusion is that free will is just socialized instinct. Near the end of the book, a quote from Wright: "our conscious mind isn't privy to all the motivating forces." And from Darwin (within Moral Animal): "the general delusion about free will obvious... his motives [are] mostly instinctive." My take on Wright and Darwin's argument is that consciousness is developed from the unconscious mind. And, the conscious mind is just a tool of the unconscious. I thought it was an interesting argument, so I shared it here.
Also, in psychology, the term subconscious is no longer really used, but unconscious is. I like unconscious better too, because "sub" makes it sound inferior to the conscious mind, which it is not. The unconscious has been developed over millions of years and Stefan has mentioned, before, that it operates much faster than the conscious mind.
Great discussion here.