Paul Murphy of cio-today.com has posted this great article. It explains why Macs are more secure than there PC/ Intel Linux counterparts as well as dispells some of the PCs are cheaper than Mac myths. Very good read. Here are some pull quotes:
The vulnerability exists in Microsoft’s code, but the exploit depends on the rigid stack-order execution and limited page protection inherent in the x86 architecture. If Windows ran on Risc, that vulnerability would still exist, but it would be a non-issue because the exploit opportunity would be more theoretical than practical.
…Macs are less expensive. That’s not what you see in the PC press, but it’s reality. The explanation for that, besides dishonesty on the part of PC reviewers going as far back as 1984, is primarily that Apple’s product cycles resemble those of other consumer electronics manufacturers, not those of the PC industry.