Well I have to say that this episode brought many a surprise for me. Turns out that the Master is just a victim of the Time Lords', Mickey and Martha are married, Captain Jack is flirting up the Midshipman from "Voyage of the Damned", and it was really Donna's sweet grandfather that kills the Doctor. I'm not sure how exactly I feel about this episode. It's sad to see one Doctor leave, but the way he left was so heart wrenching that I feel he did it justice to the end.
What bits surprised you most?