Does OSX have the playback capability yet?
OS X can't play Blu-Ray DVDs yet, (though VLC can, I wonder if anyone has a Blu-Ray disk and a Blu-Ray drive installed on a Mac that could let us know?).
What about using Windows BootCamp, installing Win7 and then using that to play Blu-Ray's?
What's VLC? I've got a Mac Pro that I could install a Blu-Ray drive into and I'm considering it.
http://www.videolan.org
It is a media player. Does all sorts of funky formats including playing .ISOs.
Not really needed if you have no problems with Quicktime + Perian, but I always put it on for those obscure formats.