so we're getting a mac (not me personally). an old imac - unknown spec. we want to put OS X on it.

there's a good guide here on how to do it. and there's more info here.

However - I have some questions: I've found the requirements for OS X 10.4 (here: 256mb ram, firewire (why?), slot loading imac supported) - but will this run on earlier macs or is that deliberately disabled? Also what are the requirements of OS X 10.3? (according to this tray loading imacs will run it fine).