I just found this blog post from a security researcher. Now that the Safari browser has been released for Windows, I start to hear more and more about various vulnerabilities.
http://www.dhanjani.com/archives/2008/05/safari_carpet_bomb.html
I post this Safari exploit because I think I lot people associate Apple with "good security." I'm not saying they aren't, I'm just advocating for general paranoia. Most people already consider Windows to be insecure, so hopefully they exercise more caution. I think computer security is partly about maintaining a healthy skepticism toward all products and companies.