Why is it wrong exactly? Imagine you have a field. If I cut through it to save myself walking around it, I haven't damaged you or your property. Now if I build a road through your field to save myself time, that's wrong, but simply using someone else's property in a non-destructive way, I don't see the problem. So no high-bandwidth or criminal usage of my network, but for innocent email checking or browsing and chatting, come one come all (I have a fonero (FON.com)). I think notions of private property have gotten out of hand, and I think that if we were talking about DMCA stuff then everyone would be on my side. But this is somehow different, I don't see it. Fair use.