Free will sort of strikes me as a quantum state of affairs. For example, if you take a particle's random motion, and multiply it as many times as you need to to reach the macro/classical scale, then all those random motions cancel out and it's a solid object arising from the closest thing in the world to nothing at all. Likewise, free will can be seen as a sort of intuitive cancellation (by process of combination) of all the deterministic mechanisms like chemical gradient, potential vs kinetic energy, electric principles, etc that exist within the brain. Also it's possible that our consciousness is flowing into us, and our bodies have only manifest to support it, and not that it has manifest to support our bodies. This deterministic, meat-based clockwork might've been the natural reaction to the inherently free-radical nature of consciousness, the more complex the brain, the more complex the consciousness that manifests it (thought and self-awareness: the ability to play a guitar and a harmonica at the same time while thinking about a person who lives far away, and being hungry and lonely all at once).
While there are very many computer scientists who have gone to great lengths at modelling brains learning about what it means to process information, and reducing the workings of the brain to the jargon of their particular discipline, I still refuse to accept they have the complete story of cognition and consciousness.
I really think it's foolish not to believe in free-will, it's also foolish not to believe in the power and ubiquity of suggestion in human society.