Windows Vista SP1 x64 EFI support and Intel Macs

If you have been looking forward to trying a Windows install without using a utility like bootcamp, think again. The BIOS was replaced by the Extensible Firmware Interface on Intel Macs. Even though Windows Vista SP1 x64 has EFI support it won't yet work on Intel Macs:

Microsoft has announced that they plan to support native UEFI 2.0 booting in a future service pack for the 64-bit version of Windows Vista. Presently, that excludes all Intel Macs because Apple’s firmware is based on EFI 1.10, not UEFI 2.0. Core Solo and Core Duo models are 32-bit only, and have no chance of using this, ever. Core 2 based models could work in the future if Apple releases UEFI-compatible firmware updates for them.