I did not know about this, probably because I've been in Texas since 2001, where Zombies would rot much more quickly due to the humidity and high temperatures. I actually found out about the Toronto Zombie Walk because of this article at The Mary Sue, which is a website devoted to female geeks.
In case anyone not American out there is wondering, CDC stands for the (American) Centers for Disease Control (and Prevention). Not Canadian Disease Control, as I once thought.
Ah, internet serendipity, reminding me of the total coolness that is my homeland. And hey, anybody been? Was it cool? Shambly? Lurching?