Hmm, I am not sure what Apple's reasons for deleting the posts were. Linux has been run on PowerPC Macs for years, so I would be surprised if Apple objected to talk of Linux on Intel Macs (unless there were direct performance comparisons with OS X that were less than favorable?). Are there any legal issues about running Solaris on a Mac, which Apple want to steer clear of?
I did a little bit of searching and found a few pages that might be of interest:
Solaris: Solaris Nevada build 36 running on an iMac Solaris on an Intel Mac using Parallels Desktop Linux: Engadget article on Linux running on Intel iMacs Mactel-Linux - efforts to get Linux running on Intel Macs
Linux vs. OS X on an Intel Mac
Oh, and as a side note, there has been mention of
Leopard being able to use Sun's ZFS...