Another perspective on the AT&T femtocell topic
Naturally, if you're paying for you own femtocell, you might feel proprietary about it, which is why they come with features to keep your neighbors from sponging off your network.
But this, too, is backwards thinking. The carriers should be encouraging your neighbors to use your femtocell. Again, it's all the more network capacity they don't have to route through the cell towers. And if the carriers were paying for the femtocell in your home, you wouldn't feel so proprietary about sharing the network.
Granted, it's your broadband connection they'd be degrading by playing Farmville on their iPhones. But again, if your carrier is buying you a femtocell, you'd probably be coming out ahead.