I don't know... I can see both sides on this. The issue is that the OSX86 guys at this point are doing things that require OBVIOUSLY PIRATED SOFTWARE. There's not yet a retail boxed version of OS X for Intel, so, that means that the only versions they could be running would be pirate.
That's the issue that Apple is having.
Wheter or not people posting to the sites were running a "pirate" version of OSX is irrelevant.
The key question here is: were the sites
distributing "pirate" software, or were they talking about how to run OSX on non-apple hardware and
maybe contributing original code and patches and kludges to do it.
If it was the first case (and I don't think it was) then the takedown is valid. If it's the second case, it would be like MS using the DMCA to keep sites from discussing ways to put Linux on the XBOX (which even MS didn't have the stones to do).