Thanks. I had heard that also, and I usually try to keep eggs in the refrigerator for a couple of weeks before boiling them. I use grocery-store eggs, though, not home-raised, and I always wonder if the problem has to do with commercial egg production techniques (feed, etc.). It does seem that the shells of commercial eggs are thinner than they were some years ago.
I have noticed that commercial eggs have thinner shells, and it probably has to do with how they are raised. We let ours free range during the day and coop them up at night to keep away predators. We just feed them the layer pellets that you buy at Tractor Supply or Rural King. Nothing special. They do get goodies like tomato or apple cores or watermelon a few times a week. That makes them incredibly happy ;) We get about 8 eggs a day...that adds up fast!