Here's a quick random thought. As has been pointed out on some other blogs one of the shortcomings of the Time Capsule is that it only protects against some kinds of needs for data recovery. One could add a little bit more protection without sacrificing the convenience by swapping time capsule's with one's neighbor and having your backups live at their house and vice versa. This only works for people in houses close enough for it to happen and doesn't protect against all ills like a flood wiping out the neighborhood but would likely provide some protection against a house fire... of course the resulting physical insecurity of all your data means you have to really trust your neighbor.