@Piru:
You are partially correct that Q3 engine mods are platform independent
John Carmack did add a bytecode engine so that that they CAN be platform independent, BUT as far as I recall he still allows for binary/compiled mods (for performance reasons), so even though Q3 comes with the byte-code version of the game code, other mods might not (I assume this is the case for many of the Q3 based games such as Call of Duty, etc, but have not valided this myself). So this will suck for Amigans, until Jens and friends give us an x86 slot on their future accelerator cards (I know, not easy) or the said games become open source, a la id Software and John Carmack style (kudos to these guys!)
Cheers
@Ivanhoe/Wirzardo/etc:
You might want to look at the LILO boot loader and the "32bit LBA" option if you want to install past the first 2GB? (I think that was the limit) of the hard drive. I believe Grub also has a similar option, but don't believe me on that, search for it. The point is, if you install Linux and the boot loader can't boot it, using a floppy or CDROM to load the kernel and passing it the right root filesystem WILL boot the OS no matter what, because the kernel does not rely on the piece of {bleep} BIOS for sector/address calculations/translations, therefore doesn't have the old limits problem (it actually uses the IDE drivers to directly talk to the IDE interface and to geometry translation). In the worst case, just install on a separate hard drive.
Good luck!