I am sure that eventually we will be able to multi-boot the intel Macs. Hell, I tri-boot my Dell notebook with WinXP, OS X x86 10.4.1, and Fedora Core 4 (you just chainload GRUB into Darwin's bootloader). The problem I have is with the file systems seeing one another. HFS+ can see NTFS, but not EXT3. NTFS can't see HFS+, and so on. Maybe I am just lazy, but it can be annoying with the different file systems not seeing eachother, especially with NTFS's mutant (read:non-*nix) file permissions.