Code Geass: Lelouch Of The Rebellion is one of the best Anime I've seen in a while. The story is set at a period in time where 'Britannia' has invaded and taken over Japan, now referred to as 'Area 11'. The 'Elevens' are pretty much oppressed by the Britains and there are a few rebel factions trying to fight back.
A new leader in the form of a vengeful Prince Lelouch emerges after he obtains the power of Geass. With it, he finally has the power that he needs to defeat Britannia and starts a rebel faction of his own. He's quite similiar to Light from Death Note as he's quite manipulative and calculates his opponent's every move.
I highly recommend it. KS posted the links for it here
if you're interested.