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I wouldn't eliminate my doorbell; I don't feel X10 is 100% reliable enough for that.
I sense the doorbell to activate lights and camera. Lots more reliable than an outside sensor and, since the visitor is (usually) looking at the doorbell button (or in its direction), I get a good camera shot of his face.
That's a good idea. Except that some undesirable people might come up to the door and not ring the doorbell. Those are the people that I would really like to record a picture of.