I've read somewhere in these forums that there is something beyond the IP that G:batman::batman:gle can identify on macs. Something that would, say, identify my friend who might try using a private proxy to sign up for adwords after a ban, perhaps, using the same computer he/she used for the banned account, but changing everything else. Seriously. Everything. He/she was thorough! If memory serves, the solution presented was to use a VPN. Completely do-able, for my friend that is. Just curious what it is that Google sees and if there's anything can be done about it.