Wooden floors suck - at least when you're having them in the dining area because the floors scratch so easily. Someone told us to put felt under the chairs so the floor boards don't scratch or to put a carpet underneath the table. The only problem is that the table extends itself - it goes from being able to seat about 6 people to about 12 people!
I think we're just sticking with the floor rug under the dining table. The problem is that when we have everyone over, we need to bring chairs that don't belong to the dining table itself.