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What is uefi useful for? I'll upgrade soon my pc and hence wonder what that is and what to watch out, as I want to triple boot Ubuntu/Win/osx86.
Well, UEFI is a system firmware standard. System firmware is useful because you can't boot your system without it.
UEFI is a 'modern' replacement for BIOS. It has several advantages in design, though in all honesty they're mostly not terrible visible to the user, and to be frank, a lot of UEFI implementations so far are quite bad.
If you get a new PC with a UEFI install of Windows 8 then you will need to do native UEFI installs of Ubuntu and OS X if you want to triple boot, or install them on separate disks; you can't mix native UEFI install and BIOS emulation installs on one hard disk.