Apple - Support - Downloads - Security Update 2006-002 v1.1 Mac OS X 10.4.5 (PPC) Work brain is going.. More and more and I starting to agree with some of the opinions I have
heard. That we are only a short leap away from a seriously nasty Mac virus/worm. As more techies get Macs the more they look for holes. Go to any major hacker conference and you'll see just about anyone who is someone is running a powerbook (macbook pro), and you'll hear hushed conversations about uber mac hacks.
Soon someone is going to get pissed at the mac ppl and release something nasty. It will be bad but will won't be the end of the world due to the limited network effect of only maybe 10% of the market.