The only one I see right off hand that I have that isn't listed is Boethiah, her shrine is located east of windhelm on the northern side of the mountains there. You have to convince someone to follow you and sacrifice them on the sacrifice pole there and then she has a quest where you kill her old champion and you get her ebony mail.
Its going to be a moment while I find the others and where the quest starts.
For the skull of corruption, I believe it starts in dawnstar. At the inn there should be a mage named erandur. Talk to him and agree to help him and he'll lead you to the quest.
Sorry about the spoilers, I have no idea how to use the spoiler tags or else I would.
Last edited by nicklesminer; 11-11-2011 at 02:59 PM.