Thats another thing i've been wondering. What exactly ARE Itachi's own goals/ambitions/motives. When he killed his clan, he basically gave the impression that he did it to test his power, but what's he doing in an organization like Akatsuki? Is he really interested in world domination?

I keep getting this idea that he's a plant by Root. I'm most likely wrong, but his lack of emotional manner reminds me a lot of sai.