I emailed Pampers. They state on their website under FAQ that they did a cost comparison study and found that cloth and disposables cost about the same. And that if you use a cloth diaper service disposables cost 40% less than cloth.
I requested a copy of the study. I smell deceiving statistics :-D
I know for fact I have saved a considerable amount of money with cloth! I will post my cost analysis for my family in a bit.