I ask this question because the system I will be using after I graduate will be a mixture of ppc and intel. Let me explain. Right now I have a PPC Powerbook G4 which I love and will continue to use as my primary machine. It will have the OS, my current project(s), and my most used apps on it's 80GB hard drive. After I graduate I will get a sweet new Intel based powermac with lots of RAM, lots of processor speed, lots of screen real-estate (2x 19", one color accurate crt, the other a crappy lcd for palettes and finder windows and stuff). Ok here's the tricky part. I plan on using the powerbook on the road (I work about 50% at home, 50% wherever else I happen to be, a bus, a cafe, a girl's bed, whatever). When I come home, I'll restart the powerbook in target disk mode, plug it in with FW800 to the powermac, and boot from the powerbooks hard drive. Then I have the same, portable computer, which usually is limited to 1.33ghz, 768mb ram, 80gb storage, and 15.2" of screen, instantly upgraded to a really fast pentium, with a lot more ram, a lot more screen, around 250gb of hd full of my lesser used apps, my previous work, games (that will run better on intel I hope), etc.. Also, while I'm not home, I'll have the powermac booted into a bare install of OS X to act as an FTP server in case I need some old project or some app I dont have on my powerbook. Sounds like a good idea right? Here is the problem: all that is pointless if I can't have all my apps, including the OS, run on both intel and ppc. I can live with the other apps being run natively on the 'book and in rosetta on the 'mac, but the OS needs to run natively on both. Does anyone know if, for instance, the installer will ask you which binar(y/ies) to install, ppc, intel, or both, when you install something, or if you can only install on binary in each .app package?