Below are some of the new improvements in the latest version of Apple’s Mac O/S:

Apple Lion O/S – New Security Features
http://isc.sans.org/diary.html?storyid=11245
http://www.apple.com/macosx/whats-new/features.html

QUOTE: Once you are over the online install experience, the upside down mouse gestures and all the other bling that comes as part of OS X Lion, it is time to look at what has changed from a security point of view. Apple doesn’t exactly advertise security features, but Lion provides some significant security improvements.

* Address Space Layout Randomization (ASLR) – will make exploiting vulnerabilities significantly harder

* Automatic Security Updates – to happen behind the scenes

* Sandboxing -limits how individual applications can affect each other, and the underlying system. I

* Encrypted Backups – Time machine backups can now be encrypted.

* Privacy – Lion uses refined privacy preferences in particular limiting the access to location information