I?m going to describe steps needed to have the following system:

Dual-boot with Arch Linux / Mac OS X
Boot manager UEFI Gummiboot (simple, can handle several kernels easily)
Full disk encryption (Mac OS X and Arch Linux)
LVM support
Suspend to disk using a swapfile
Settings for a great battery life (~09h30)

I keep the Mac OS X partition, to be able to update the firmware later.