First of all "Flashback Trojan" is not a virus, nor it posing any threat to Apple Computers. Apple still holds the grounds in virus war - no virus has been written for Apple that will install itself without knowledge of the owner.
In short - if the Apple user is stupid enough to install bootlegged programs - there is no security in the world to help.

So all the fuzz and buzz that is circulated by Bill Gates die-hards is nothing else but fingerpointing without valid ground.
Those 500-700 thousand Apple-based botnets installed by their owners are either new MS switchers or people who never used their heads and hunting for freebies no matter what.

If one needs to upgrade/update a flash player on Mac - here is the address: Adobe.comThere's no place like ~