MEPIS Linux 7.0 is compatible with Apple Intel computers: those based on Intel x86 CPUs, with the exception of some small details. Intel Core 2 or Xenon-based Apple computers can run 64-bit MEPIS, but all Intel-Core-based Apple computers can run 32-bit MEPIS.
MEPIS Linux 7.0 has a utility for preparing your Apple bootable hard drive for OS X so that you can install MEPIS Linux painlessly. This MEPIS Assistant is compatible with OS X Tiger and Leopard. There is a README file in the in the LiveCD OSX directory with more information.
Instructions for installation:
NOTE: the Installer disables options that would be likely to damage your OS X System Drive. Do not try to use parted, gparted, or qtparted to do anything on an OS X System Drive. If used, parted will probably destroy the OS X installation and make the disk unbootable.