OSX is basically FreeBSD unix under the hood with a very nice GUI. Given the fact that dual processor G5's are essentially high performance Unix workstations that also happen to run all of those so-called 'productivity apps', I'm wondering if we'll see any Commercial EDA apps released for the platform? Most of the OpenSource EDA tools like Icarus, GHDL, GTKWave, etc. are already running on OSX (it's quite easy to port code from Linux to OSX - usually no changes are required).
I suspect that support issues would probably be less than those associated with Linux as well because there are less flavors. Having a plethora of choices of distros is one of Linux's strong points and it's just fine as long as you've got the source code for a given tool (like those listed above) but with closed-source tools it can be problematic which is why most EDA vendors still only support RedHat 7.2 (I recall running that version back in '99 :) or maybe RH 8.0. And then there's 64bit support: are you going to support Opteron or Itanium binaries (or both) for example.
Don't get me wrong, I still like and use Linux, but after using OSX for a few months I'm really liking not having to be a sysadmin for a laptop. ;-) This would also seem to be a benefit for companies as well. Sure Apple hardware is pricier than PC hardware, but when you compare that price difference (maybe $500 at the highend) with the price of EDA software ($5K - $100K+) the price difference is insignificant compared to the potential benefits. Since each engineer would only need one OSX machine on their desk (it runs those so-called 'productivity apps') that would probably make up for the price difference quite easily.
Phil