Here is a great column from Wired magazine about why Bruce Schneier doesn't secure his home wifi network. I don't secure mine, either... mostly because of karma. I appreciate using free wifi when I'm on the road, and I figure that I should return the favor. Of course, I live out in the boondocks, so my hunch is that only 3 or 4 neighbors are close enough to take advantage of my generosity. But if their ISP croaks one day, they've at least got a backup. And yes, all of them have secured wifi networks.
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