That said, let me direct your attention to Rich Mogull's Five Ways Apple Can Improve Mac and iPhone Security.
This is an excellent article outlining some structural weaknesses in
the way Apple, as a development company, approaches security. According
to Mogull, and he outlines his arguments clearly, Apple management does
not foster a modern attitude toward secure programming and management.
Why should we care, especially if criminals are attacking us in a
variety of ways Apple and other vendors can't possibly protect us?
Because every weak link in an application or operating system makes
cyber crime more lucrative and draws more cyber criminals.
The moral of this story is that no one, not even the Mac user most
strongly convinced that Apple has done everything possible to protect
him and no criminals care about his Mac, can ignore security. If you go
on the Web, you have to worry about security. Period.
You know those bad parts of town, where smart people never go? Those
parts of town are everywhere on the Web. Any where you go, the bad part
of Web town is one URL typo away, one e-mail attachment away, and one
weak password away. The Web is wondrous and captivating, but it's also
crime riddled. Watch your step. Be careful out there, no matter what
type of computer and operating system you're driving.
James Gaskin for 
: See Article.