What's EFI, you ask? Simply put, it's Intel's replacement for BIOS. You can read more about Extensible Firmware Interface here. Both Linux and Macs have been able to boot from EFI for quite some time, and current Power PC based Macs use a form of EFI called Open Firmware. Going with that vibe, Apple plans to use EFI on their Intel Macs. Sounds great. doesn't it? Your new Mac can run in dual-boot with Linux, but what about XP and the upcoming Vista? Sorry to break the news, but it looks like Microsoft isn’t planning on having Windows and Mac OS X exist in harmony. Apparently at a developer forum in San Fransisco, a Microsoft manager stated that Microsoft will never support EFI on 32-bit chips, and we'll have to wait till the Longhorn server comes out for any kind of EFI on 64-bit. Of course you know how many home users go out and by server versions of Windows.