On your old hard drive you need to find the PM preferences folder. It should be in the following location:
<Old HD name>/Users/<your short username>/Library/Preferences/com.camerabits.PhotoMechanic/
All of the files and folders in that folder can be copied to your new system, but you may have some problems (that can be corrected in PM itself) with paths to various items that may not exist on your new computer (or are in a different location). Examples would be the disk cache path (if you ever changed it from the default, which can be fixed in the Caching section of the prefs dialog), and paths to your favorite editor applications (can be updated in the Launching section of the prefs dialog.)
I expect the rest of the settings to just work. If you have difficulty and want help contact our support folks after the holidays.
By email:
support@camerabits.comBy phone: +1 503.547.2800 option 2
Hours: Mon-Fri, 9:00am-5:00pm [PST/PDT]
HTH,
-Kirk