What Should I See in Paris?

I've been reading Paris for Dummies (2005), but today checked out guides more up-to-date. They are Access Paris: The Only Guide That Leads You Street by Street into the Heart of the City, published in 2008; and Fodor's Paris 2009. Using these books, I'm drafting a schedule of what I want to see and when during my week in the City of Lights. What would be at the top of your list?