I'd save that for the guy that set up a website handling millions of dollars' worth of other people's money without even basic security precautions. At least those e-mails are vaguely useful. He or she is even recommending a sensible replacement for Mt Gox; as far as I know Tradehill's the only bitcoin trading site that no-one's found CSRF vulnerabilities on yet, which hopefully means they're actually taking security seriously.