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So what's it all mean? Well for one, hopefully the idea that Mac OS X is somehow magically secure has been shattered. It is not "magically" secure, it is methodically secure. The security methods behind Mac OS X are not terribly exciting or new, they are the result of a lot of smart people doing good work for a long time. Nor is Mac OS X perfectly secure. It never was, it never shall be. It means that just like everyone else, you have to take some precautions when bouncing about the Internet, but then you've always had to do that. It doesn't mean that Mac OS X is now less, or still more secure than any other OS. It has, like every other OS, advantages and disadvantages.
If you are going to take one thing away from the CanSecWest vulnerability, take away a new resolve to make your patching methods better than before. Maybe start reading more security web sites, and set up a Nessus scanner so that you can better know your own network's security posture. If you want to more actively know what's going on with your network traffic, consider Snort. If you're a sysadmin, you should have been doing this anyway, but maybe this will help give you both impetus and moral authority to do so now.
Mac OS X is as secure as it ever was. The only problems have been caused by people with mistaken ideas of what that really meant.