It doesn't seem that bad. He mentions exchanges other than Tradehill and you don't HAVE to click his link. Actually I think it could be quite informative to traders who don't follow the forums or know of any other exchanges.
You're wrong, Mt. Gox already sent out a warning email to all of their users with an associated email account. Furthermore, there's no need for the spammer to mail bomb each and every person from the leaked db I've received the spam 9 (NINE!) times from the asshole who claims to have ref.code TH-R15683.
Cheers,