Seems like this kind of thing was inevitable. Because it depends on a user with a Mac with ATI graphics and the user not noticing high GPU usage, it seems like this probably won't be that profitable. Part the sucks the most is the uninformed started to associate the bitcoins with a virus. We need good associations/press, not things like this.
Wouldn't be hard to limit how much GPU power the miner uses to specifically prevent anyone from notice. A lot of malware these days are doing about the same thing by cleaning and patching competing bots off of peoples computers so that the infected computer won't get too slow, which is often the only hint a lot of people have they are infected.