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It's unnoticeable and hardly takes up any disk space or system resources.

Rosetta is more than the simple file you download. It requires them to have system files compiled for two architectures. Moving to intel-only will make things simpler and easier to maintain.

If I can play Nintendo and Commodore games on OS X with an emulator, I'm sure there's a way to run Power PC apps with an emulator. If it's not Rosetta, someone else will write a program to do the same thing.

They might, but it will suck, be a pain to set up, and not work with the majority of apps. (Like Sheepshaver.)

BTW, I've heard people say that you could run Snow Leopard as a VM in Parallels, is this even possible? I thought you couldn't install OS X in a VM.
 
BTW, I've heard people say that you could run Snow Leopard as a VM in Parallels, is this even possible? I thought you couldn't install OS X in a VM.

Yes. I think the idea is that you can run multiple virtual instances of OS X Server on a single piece of hardware, as is often done in enterprise networks with virtual Linux and Windows servers. I imagine things like Quartz Extreme and graphics acceleration do not work, though.
 
Why would you bother with Virtuals? Just create a small partition and install 10.6 on it. It's not even overly difficult to setup multiple Mac partitions. using Disk Utility The system will allow you to choose which OS you want to boot from by simply holding the Option key during boot or you can use something a bit more friendly like ReFit to select a bootable partition.
 
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