Whilst this one speaks about the Mac OS X and compares it with Microsoft's Vista security features, the same can be said of 's security. Mac OS X and Linux, both coming from a Unix background, share practically the same base security design, i.e., administrators/root and users are two different beasts with different privileges and access rights.
Not until recently has Microsoft realized this – BUT wait – it seems like Microsoft is claiming that their User Account Control (UAC) is one that all operating systems should aspire for. This is true if Microsoft did this twenty-thirty years ago!
Heck, if this is what all OS should aspire to, then forget it! I'm pretty satisfied with "sudo", both on my Ubuntu box and Mac OS X. How about you – would you rather click on a dozen windows to delete a single file?
[apologies to Apple, Inc. for the video]