Re:Linux history on Macs (Score 2, Informative)

Actually the Intel Core Duo already supports Virtualization. From page 12 of http://www.intel.com/performance/resources/briefs/ mobiletechnology.pdf

Intel® Virtualization Technology The Intel® Core(TM) Duo Processor includes support for Intel® Virtualization Technology which is a set of hardware enhancements to Intel server and client systems that combined with the appropriate software, will enable enhanced virtualization robustness and performance for both enterprise and consumer uses. Intel Virtualization Technology forms the foundation of Intel technologies focused on improved virtualization, safer computing, and system stability. For client systems, Intel Virtualization Technology's hardware-based isolation helps provide the foundation for highly available and more secure client virtualization partitions.

And from the Xen 3.0 datasheet http://xensource.com/files/xen_3.0_datasheet.pdf

Virtualize All Operating Systems with Support for Intel® VT Hardware Virtualization Xen 3.0 is the industry's first virtualization infrastructure software to support Intel Virtualzation Technology (VT), which allows virtualized servers to run natively on the processor. This enables the hypervisor to exploit hardware acceleration for CPU and memory virtualization and is key to Xen's ability to virtualize all operating systems.

So put together, this already indicates that the Intel iMacs should already support running Windows XP natively without any changes to the Windows Kernel and "theorectically" (correct me if I'm wrong, i probably am) if th Xen Hypervisor were loaded, you could run both Mac OSX and Windows XP natively at the same time without any changes. Of course Xen Hypervisor actually requires a flavor of Linux to already be installed on the workstation, so I guess a bit of "hacking" may actually be required to get it working. But once RedHat manages to find a way to install itself, that will lead the way to running everything else (windows, linux, mac os x86) running close to natively on the Core Duo machine without any other modifications.