You don't need to be able to boot to OS9 to use Poser4. The new Macs will still run the classic enivronment (from within OSX) which is all you need to run Poser 4. A few of the utlility programs (like Thumbnailer) won't run in the classic environment but other than that it's pretty much a non-issue.

"Do not meddle in the affairs of cats, for they are subtle and will piss on your computer." -- Bruce Graham