"Hi, my name is Peter Ha and I'm a Windows user." That's what I used to say at my Windows Anonymous meetings, but now I can proudly say that I'm a Mac user. I made the switch last summer after I moved to NYC and left my PC desktop back on the West Coast. The transition was pretty smooth, but I still have a long ways to go in regards to all the tips and shortcuts. I was under the impression that OS X Tiger was virtually bullet proof, which is why I made the switch in the first place, but I guess I was wrong.
According to IT Security, Tiger was left in a "fairly insecure default configuration" because of the bells and whistles and UNIX-based architecture that makes Tiger so user friendly. The site compiled a list of the top 12 security issues and how to fix them. It's aimed at novice Tiger users and doesn't really apply to expert users, but it doesn't hurt to take a look.
Some issues may require simple fixes that will make you want to kick your own ass, but others are a bit more serious. Who knows whether or not I set up my firewall correctly and I know I've been mindlessly surfing with Safari (only for a few days, though, until I got Firefox). It's definitely a good read and maybe you know someone that might find it useful.
Top 12 OS X Tiger Security Issues