What does 'Guilty Crown' mean actually? As the topic/question says, what is the meaning if the name of the anime. I want to tell you that I watched the series because of its peculiar name. But after watching the entire series, I could not decipher the relation between name and the series itself! Am I missing something? Surprise me!
I take it to be the main character being thrust into a conflict against his will while also providing him an overpowered power he never really wanted, i.e. his Guilty Crown.


  "The right to use my friend as a weapon. That is the sinful crown I shall adorn. I accept this 'guilt.'"


EDIT: Seemed a bit of confusion and adding the detailed comment by Hikari to the answer verbatim.


  in guilty crown the protagonist is only able to wield his power by pulling the soul of another person. If he breaks that soul they die and he carries that guilt and shame of not being able to do anything alone. Just like a king may "technically" rule a country but only on top of the shoulders of the people who believe in him and the soliders who die for him. And typical of the shounen genre all of this is thrust on the shy,wallflower like boy with no confidence. That is where the title came from. It is more like an allude as to what the whole series portrays. – Hikari