Quick political take: I think this will actually be bigger than taking Saddam. Not that the whole situation will be transformed or anything, but there's a difference between the top acting terrorist commander and a deposed leader hiding in a rat hole. That and a much needed morale boost, both for us and the Iraqis. This won't make it easy by any means, but it already has lead to agreement on controversial Iraqi ministry jobs.
If the Iraqi and American leadership actually manages to consolidate this victory, we could be seeing a much better situation. And, to be clear, consolidate doesn't mean burying investigations of atrocities and such.
It is definitely a good day.