I think that the link between eating peanuts/peanut products during pregnancy and the rise in peanut allergies is a theory. I don't believe that enough research (or any research) has been done to prove that. From the way I read it, experts were trying to figure out why peanut allergies in children are on the rise, and the logical explanation to them seemed to be to blame the mother!
I ate peanuts and peanut butter throughout both of my pregnancies. My daughter now eats peanut butter all the time--no allergy for her. However, my son is 14 months and has some other types of allergies and skin problems, so I haven't given him peanut butter or nut-flavored foods yet just to be safe. If he does end up w/a peanut allergy, I don't think it's because of what I ate while pregnant w/him. I think it'll be more related to the fact that he's more suseptible to allergies in general.