Remember how I've been saying that the security of OS X is an illusion? Well, just in case you wanted some proof, The Register has the play-by-play of a public 0\/\/ning of a (fully-patched) OS X system.
The victim, a security researcher who asked to remain anonymous, had locked down the system prior to the conference and believes that a previously unknown exploit caused the compromise... [weeks later] forensics performed on the system did not reveal any clues as to how the PowerBook had been compromised.
Awesome! So, there's a 0day that's still out there that lets hackers have full control of my Mac? Thanks, Apple - I think I'm starting to "think differently" now...
Oh, and just in case you missed it, Rebecca Freed over at PC World has an article about Mac's superior security.
Another reason that Mac users tend not to worry about exploits is that Apple tends to patch discovered vulnerabilities quickly. In 2005 Apple issued nine security updates as well as product updates incorporating security patches.