I had a seriously crazy idea today... I thought I'd share, not sure how it would be pulled out in the prequels...

What if Anakin had a split personality disorder, so Anakin Skywalker was one side of his personality and Darth Vader was the other. The Vader side could slowly take over throughout the course of the trilogy. The Vader side could do horrific things, and Anakin could still be heroic. It would I think bring a new perspective to Obi-Wan saying that Darth Vader betrayed and murdered your father....