Out of curiosity, using (and spoofing the mac address of) a usb wireless card wouldn't provide any more anonymity connecting to the internet (behind a vpn on public wifi) over the built in wireless card a cheap disposable laptop would have, would it? I think if anything it would leave an even longer trail of being traceable because that's just another purchase you'd have to make for the wireless adapter. Off topic, but just to save everyone from reading another post, is there any true benefit of using a proxy whilst also on a vpn? Any additional benefits considering it would probably make browsing extremely slow? Thank's.