Wow, Network World, you need to pull this article if for nothing other than the sake of your own reputation. This is easily the more poorly written and researched piece I've ever read on this site, and that includes the comments. Where shall we begin?

Let's see, the calDAV server is not called Darwin; You can't compare an CHIP to an OPERATING SYSTEM (Of course the new OS can use the same amount of memory as the processor: it runs on that processor!!); XSan has nothing to do with clustering (other than providing shared media which any SAN can do); Being able to edit user account or firewalls or system monitoring through the preferences panel? Nothing new since this has been part of OSX for nearly 10 years.

Frankly, I'm embarrassed for you Network world.