Living Life, Virus Free
You have probably seen Apple's commerical touting the fact that although there were 114,000 known viruses for PC's last year, there were none for the Mac. If you know someone who is still using a PC, odds are that you know someone who has been exposed to a virus.
The simple fact is that PC's are susceptible to having its operating system modified by a virus, often without the operator even knowing it is happening. On the other hand, Macs require you to type in your password before it allows any significant changes to be made.
PC users are compelled to purchase virus protection software to minimize the risk of attack. Even worse, this software is expensive, and it must be constantly updated. Many Mac users (myself included) have no separate virus protection software. I have never had any virus issues with my Mac.
I understand the need for security, but I believe that OS X's security features are more than sufficient for my needs. Macs allow you to save money and have peace of mind. To find out more about Macs and viruses, read "114,000 viruses? Not on a Mac" at Apple's website.