so far theres no viruses that a ps3 can get,its nearly impossible until someone has access to all of the os the ps3 uses and that has never happened,viruses are unlikely on a mac but it can happen no doubt and as far as Linux goes there is viruses but they can't never really do anything unless you always use your system as root..
yea which is what im trying to say
the ps3 is going to be virus prone soon. the kid that hacked the iphone just announced he hacked the ps3 last week. and the hack/exploit is, something sony can't patch. so were going to be screwed if he lets out, the information on how to do it.
Firmware updates fix these problem. He finds a hole and uses it. Next firrmware update fixes said hole.