Q: One visitor asked, "I have a hardwood floor that is not level. It is level in the center but when you go towards the sides it is not. I was wondering what I could do to get this floor level so i could put a laminate hardwood floor down."

A: I don't believe laminate manufacturers recommend installing laminate over hardwood flooring. Is your hardwood in such bad shape that it could not be properly sanded and finished?
That aside, how much of a dip are we talking about here? If it is not too severe, you could use building paper to build up the dip. However, if it is a hump, you have a bigger problem.

Q: "I came to a decision to tear off old floor and level it up the proper way I just have one more question. I was going to use osb board for the subfloor and then put the laminate floor over that. Would that be ok?"

A: I have never read a spec on not using osb as a sub floor for laminates. I have read that they (or some versions of them) are ok for nail down also, but I still prefer real wood plywood. You should be fine.