No problems if I restart the service after boot, so this seems to be a race condition.
boot_fail_log.txt
boot_fixed_log.txt
pommed.service.txt
To save you digging through the logfiles to check:
Arch Linux
MacBookPro5,5
Attached are logs before and after I changed the pommed.service file to set After=sound.target, and WantedBy=sound.target
Not the most elegant approach (since it assumes we are using the volume control hotkeys).