It's been quiet here at the moment so I'm so I am going to make some noise on OS X Mountain Lion GM. I managed to install GM on my USB stick by replacing AppleACPiPlatform.kext with 10.6.8 version (1.3.5) as mentioned in this thread & the myHack 3.1.2 version. Successfully installed GM on a new partition(yay!), run RunMyFix/Full on the installed GM drive, no KP (yay again!) but it won't go through the boot process(oh no!); it got stuck in the middle at the dreaded "PCI configuration begins". Any suggestion, GURU's, anyone?
Update: I re-install AppleACPIPlatform.kext (v1.3.5) and everything goes through the boot process. Installed iPhoto 9.3.1 from Software Update. So far so good, have to do more tests. BTW, didn't install any EDP yet!. I will update the thread as I goes out to tests running some applications: iMovie, iPhoto, Adobe products, etc. It should all work but just want to perform some testing. yay!