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"But such a network, which uses cheap off-the-shelf components, might also be easily deployed by your neighbor or anybody else wanting to monitor movements in your home."
They make it sound as if someone's likely to spy on the readers of the article. But given the Slashdot population, isn't it more likely to be the other way around?
Take a look.
I saw this extension half a year ago and thought it was a great idea. But it was so sluggish and under-used that I abandoned it about a week in.